Dr. Timlioğlu | Vision Rehabilitation Therapy After Brain Injury

Treatments

Book an Appointment

A brain injury, whether from a stroke, a traumatic incident, or another neurological condition, can be significantly life-altering. While physical and cognitive challenges are often at the forefront, vision problems—which are frequently overlooked but can profoundly impact quality of life—may also arise. These problems may not be as simple as just blurred vision; they can manifest in various ways, including double vision (diplopia), reading difficulties, loss of balance, and even dizziness. Considering the fundamental role vision plays in learning and interacting with our environment, such issues can make daily life quite challenging.

Fortunately, these visual difficulties that arise after a brain injury do not have to be permanent. A specialized field of therapy known as Vision Rehabilitation Therapy (VRT) or Neuro-Optometric Rehabilitation offers a promising approach to overcoming these problems. This therapy is based on the principle of neuroplasticity, the brain’s incredible ability to adapt and relearn. VRT aims to improve patients’ quality of life by re-establishing the disrupted communication between the eyes and the brain and by enhancing visual skills. In this article, we will discuss in detail how brain injury can affect the visual system and the role that Vision Rehabilitation Therapy plays in overcoming these challenges.

What is Brain Injury and How Does it Affect Vision?

Brain injury refers to any condition that damages brain tissue and disrupts normal brain functions. These injuries are primarily examined in two main groups:

Traumatic Brain Injury (TBI): This type of injury occurs when an external physical force (an impact, blow, jolt, or penetrating injury) affects the brain. Falls, traffic accidents, sports injuries, or physical assaults are common causes of TBI. A concussion is generally considered a mild form of TBI that causes temporary functional impairment, but repeated or severe concussions can lead to more permanent effects.
Non-Traumatic Brain Injury: This category includes damage that occurs without an external blow to the brain. One of the most common causes is a stroke, where brain tissue is damaged due to an interruption of blood flow to the brain (ischemic stroke) or bleeding within the brain (hemorrhagic stroke). Other causes include a lack of sufficient oxygen to the brain (anoxia or hypoxia, e.g., after cardiac arrest, near-drowning, or carbon monoxide poisoning), brain tumors, infections (like meningitis, encephalitis), and neurological diseases such as Multiple Sclerosis (MS). Additionally, conditions like whiplash, characterized by sudden neck movements, can also affect brain functions and, consequently, vision.

It is important to understand that brain injury is not limited to obvious events like head trauma or stroke; more “silent” conditions like oxygen deprivation can also have serious consequences. This means that a wide group of patients who have experienced brain injury for various reasons may suffer from vision problems.

How Does Our Brain See?

Seeing is not just a function of our eyes; it is actually a complex process that is largely carried out by our brain. The process works as follows: The retina, the light-sensitive layer at the back of our eye, perceives light from the environment. Special cells in the retina (photoreceptors: rods and cones) convert this light into electrical signals. These signals travel from the eye to the brain via the optic nerve, which is composed of more than a million nerve fibers.

The optic nerves meet at a junction at the base of the brain called the optic chiasm. Here, the fibers from the inner (nasal) retina of each eye cross over to the opposite brain hemisphere, while the fibers from the outer (temporal) retina remain on the same side. Thanks to this crossing, the right side of our visual field is processed by the left hemisphere of our brain, and the left side is processed by the right hemisphere. After the optic chiasm, the signals reach an intermediate station in the thalamus called the lateral geniculate nucleus (LGN). The LGN organizes the visual information and transmits it via nerve pathways called the optic radiations to the primary visual cortex in the occipital lobe, located at the back of the brain. The visual cortex and other associated areas of the brain interpret these raw signals, allowing us to perceive colors, shapes, movements, and depth, and to recognize what we see. In short, our eyes capture images like a camera, but the actual act of “seeing” takes place in our brain. Damage at any point along this complex visual pathway can affect our ability to see in various ways.

Effects of Brain Injury on the Visual System

The vision problems that arise after a brain injury are often far more complex than the refractive errors like myopia, hyperopia, or astigmatism that are detected in a standard eye examination and corrected with glasses. A brain injury disrupts the brain’s ability to receive, process, and interpret visual information and its ability to control eye movements, rather than the physical health of the eyes. Therefore, even if a person’s eyes appear structurally completely healthy and they achieve normal results like 20/20 on standard visual acuity tests (e.g., a letter chart), they can still experience visual difficulties that seriously affect their daily life. This explains why it is necessary to go beyond standard examinations in diagnosing post-brain injury vision problems. Standard tests often do not reveal deficits in functional visual skills.

Some specific effects of brain injury on vision include:

Eye Muscle Control and Coordination (Binocular Vision): Our brain controls the six pairs of muscles (extraocular muscles) that move our eyes with precision, and the nerves that manage these muscles (the oculomotor, trochlear, and abducens nerves – 3rd, 4th, and 6th cranial nerves). A brain injury can cause damage to these nerves or the relevant control centers in the brain, leading to paralysis (paralytic strabismus) or weakness in the muscles. This disrupts the ability of both eyes to focus on the same target simultaneously and in harmony (binocular vision or eye teaming). As a result, strabismus (misaligned eyes) or diplopia (double vision) can occur.
Focusing (Accommodation): When we look at a nearby object, the lens inside our eye changes shape to bring the image into clear focus. This automatic focusing process (accommodation) is carried out by the ciliary muscles, which are controlled by the brain. A brain injury can affect this mechanism, making it difficult for a person to focus on near objects (accommodative insufficiency), focus on distant objects (accommodative spasm), or quickly adjust focus between different distances. This leads to blurred vision, eye strain, and reading difficulties.
Eye Tracking (Oculomotor Control): Tasks like our eyes jumping from one word to another while reading (saccades) or following a moving car (pursuits) require precise control from the brain. A brain injury can impair the speed, accuracy, and fluency of these eye movements (oculomotor dysfunction). This can lead to problems such as losing one’s place while reading, skipping words, slow reading, poor reading comprehension, and difficulty tracking moving objects.
Visual Field: The visual cortex and its related pathways in the brain process information from different parts of our visual field. When conditions like a stroke or TBI damage these areas, a loss can occur in a portion of the visual field. One of the most common is homonymous hemianopsia, which is the loss of half of the visual field on the same side (right or left) in both eyes. This makes it difficult for the person to notice objects on the affected side, increases the risk of bumping into things, and makes reading difficult.
Visual Processing and Perception: Seeing is not just about transmitting an image to the brain, but also about making sense of, interpreting, and using that information. A brain injury can affect these higher-level visual processing skills. A person may have difficulty recognizing objects or faces, be unable to distinguish colors, have impaired depth perception, have a weakened visual memory, or develop visual neglect. Visual neglect is a condition where a person fails to notice or pay attention to visual stimuli on one side, usually the side opposite the injury, even if their visual field is intact. Such processing problems can severely affect reading, writing, driving, navigating, and even simple daily activities.

The fact that these functional vision problems cannot be easily detected with standard vision tests can lead to a failure to understand the source of the difficulties experienced after a brain injury. Therefore, it is of great importance that individuals experiencing such symptoms undergo a comprehensive neuro-optometric evaluation that includes special tests to assess functional visual skills.

What is Vision Rehabilitation Therapy (VRT) / Neuro-Optometric Rehabilitation?

Vision Rehabilitation Therapy (VRT), also known as Neuro-Optometric Rehabilitation, is a specialized branch of therapy concerned with the diagnosis and treatment of visual disorders that arise due to brain injury (traumatic brain injury, stroke, brain tumor, etc.), neurological diseases (such as MS, Parkinson’s, Cerebral Palsy), or other developmental problems. The primary goal of this therapy is not just to improve the health of the eyes, but also to optimize the complex interaction between the eyes, the brain, and the body. VRT targets functional vision problems (eye teaming, focusing, tracking, visual perception, etc.) that cannot be solved by standard eyeglasses or contact lenses alone. The therapy consists of personalized programs designed to enable the brain to process visual information more efficiently and to regain lost visual skills.

The Brain’s Power to Heal: Neuroplasticity

The effectiveness of Vision Rehabilitation Therapy is based on the brain’s remarkable ability called neuroplasticity. Neuroplasticity is the brain’s capacity to reorganize itself structurally and functionally throughout life in response to experiences, learning, and environmental changes. Even when the brain is damaged, it does not remain completely static. Through the right kind and sufficient repetition of stimuli and therapeutic exercises, the brain can restructure damaged neural connections, form new ones, and compensate for lost functions by transferring them partially or fully to other brain regions.

VRT aims to activate precisely this neuroplasticity mechanism. By using specially designed exercises and visual stimuli, the brain is continuously “taught” to process visual information correctly and to control eye movements more effectively. With repetitive practice, the brain strengthens and adapts its neural pathways to perform these new tasks. This explains why VRT can be effective in improving underlying neurologically-based vision problems, rather than just masking symptoms, and offers hope for the potential for recovery after a brain injury.

Common Vision Problems Treatable with VRT After Brain Injury

A brain injury can affect many different aspects of the visual system, leading to a variety of symptoms. Vision Rehabilitation Therapy (VRT) plays an important role in the management and improvement of many of these problems. Below are some of the vision problems frequently encountered after a brain injury that can be targeted with VRT, and VRT’s approach to them:

Double Vision (Diplopia)

This is the perception of a single object as two separate images. This condition occurs when a brain injury affects the nerves that control eye movements (3rd, 4th, or 6th cranial nerves) or disrupts the brain mechanisms that ensure eye alignment (strabismus). Conditions like Myasthenia Gravis or Thyroid Eye Disease can also cause double vision independently of a brain injury but can co-exist with one. Double vision can make daily activities like reading and walking difficult and can lead to dizziness and balance problems.

VRT Approach: Treatment depends on the underlying cause. Within VRT, special prismatic lenses can be used to fuse the images into a single point. Special eye exercises are applied to improve the coordination and strength of the eye muscles. In some cases, botulinum toxin (Botox) injections to temporarily weaken certain muscles or strabismus surgery for permanent correction may be necessary. VRT can also play a supportive role before or after surgery.

Eye Tracking Problems (Oculomotor Dysfunction)

This is the inability of the eyes to follow a moving target smoothly and fluently (pursuits) or to jump quickly and accurately from one point to another during tasks like reading (saccadic movements). This condition leads to symptoms such as skipping lines while reading, losing one’s place, slow and inefficient reading, and difficulty with reading comprehension.

VRT Approach: Special exercises designed to improve the speed, accuracy, and coordination of eye movements are used. Computer-based programs help to improve saccadic and pursuit skills with interactive tasks. Progress is monitored with assessment tools like the DEM (Developmental Eye Movement) test.

Focusing Problems (Accommodative Disorders)

This is a disorder in the ability of the eye to focus clearly on objects at different distances or to sustain that clarity. It can manifest as difficulty focusing on near objects (Accommodative Insufficiency) or as blurred distance vision due to excessive contraction of the focusing muscles (Accommodative Spasm). Symptoms include blurred vision at near or far, difficulty changing focus, eye strain, headaches, and avoidance of near-point activities like reading.

VRT Approach: The goal is to increase the flexibility, speed, and stamina of the focusing system. Exercises with lens flippers (tools for rapidly switching between plus and minus lenses), special therapeutic lenses, and computer-based focusing programs are used.

Eye Teaming Problems (Binocular Vision Disorders, Convergence Issues)

This is the inability of the two eyes to work together as a single unit in a coordinated and efficient manner. The most common type is Convergence Insufficiency (CI), where the eyes cannot turn inward sufficiently when focusing on a near object. Convergence Excess (CE) is when the eyes turn inward more than necessary when looking at near. These conditions can cause eye strain, headaches, letters moving or appearing double while reading, distractibility, and reading difficulties. CI symptoms, in particular, can be confused with the symptoms of Attention-Deficit/Hyperactivity Disorder (ADHD).

VRT Approach: The focus is on improving the ability of both eyes to work together (fusion) and to turn inward/outward (vergence). Home exercises like the Brock String and Pencil Push-ups, in-office special exercises, prismatic lenses (sometimes used, though controversial), and computer-based vergence programs are used. The CITT (Convergence Insufficiency Treatment Trial) studies have shown that office-based VRT is particularly effective in treating CI.

Visual Field Loss (Hemianopsia, etc.)

This is the loss of a portion of the area one can normally see. The most common form is homonymous hemianopsia, which is the loss of the same half (right or left) of the visual field in both eyes. It is usually caused by damage to the brain’s visual pathways (optic radiations or visual cortex) as a result of a stroke or TBI. It can cause a person to bump into obstacles on the affected side and to be unable to find the beginning or end of a line while reading.

VRT Approach: Although the lost visual field cannot be restored, VRT helps the person to use their remaining visual field more effectively. Scanning exercises teach the person to consciously turn their head and eyes toward the area of loss. Prismatic lenses can shift the image toward the person’s intact visual field, increasing their awareness. Visual search tasks and computer programs are also used.

Visual Processing and Perception Disorders (Visual Neglect, Visual-Spatial Problems)

These are impairments in the brain’s ability to understand, interpret, organize, and use visual information from the eyes to interact with the environment. Visual neglect (usually left-sided neglect) is a condition where a person fails to notice objects, people, or events on one side, even if their visual field is intact. Visual-spatial problems include difficulty perceiving the location, orientation, size, or position of objects relative to each other; depth perception can be impaired, and right-left can be confused. Skills like visual memory and visual discrimination can also be affected. These problems make many daily activities, such as reading, writing, dressing, and navigating, difficult.

VRT Approach: Various strategies and exercises are used to enable the brain to process visual information more effectively. Visual attention tasks, visual discrimination (differentiating similar shapes/letters), visual memory exercises, spatial relationship puzzles, visual-motor integration activities (drawing, working with blocks, etc.), and computer-based perceptual training programs are applied.

Light Sensitivity (Photophobia)

This is a condition of extreme sensitivity and discomfort to levels of lighting that are normally not bothersome. It is common after a brain injury and can trigger or worsen migraine-like headaches. It makes it difficult for a person to be in bright indoor spaces (supermarkets, offices) or sunny outdoor environments.

VRT Approach: One of the most effective methods is the use of special tinted therapeutic lenses (filters) that filter out specific wavelengths of light that cause discomfort. These filters increase visual comfort, allowing the person to see more easily. Additionally, tolerance to light can be gradually increased through controlled light exposure exercises.

Visually-Induced Balance and Coordination Problems

The balance system works by integrating information in the brain from the visual, vestibular (inner ear), and proprioceptive (position information from muscles and joints) systems. A brain injury can disrupt one of these systems or the coordination between them, leading to balance problems and dizziness. Disorders in the visual system, in particular (e.g., double vision, eye alignment problems, visual field loss, visual processing errors, the perception of moving images), can send incorrect or conflicting signals to the brain, disrupting balance and causing a sensation of dizziness.

VRT Approach: The aim is to optimize the visual system’s contribution to balance. Visual-vestibular integration exercises improve the coordination between eye movements and head movements. Prismatic lenses can aid in balance by altering spatial perception and stabilizing visual input. Visual-motor coordination and dynamic balance activities may also be part of the VRT program.

Table 1: How Vision Rehabilitation Therapy Helps with Vision Problems After Brain Injury
Vision Problem	Common Symptoms	How VRT Helps
Double Vision (Diplopia)	Seeing a single object as two, dizziness, balance issues, difficulty reading.	Prismatic lenses, eye muscle coordination exercises, Botox (in some cases), surgery (in some cases).
Eye Tracking Issues (Oculomotor Dysfunction)	Skipping lines/words while reading, losing place, slow reading, inability to follow moving objects.	Tracking and saccadic exercises, computer-assisted programs.
Focusing Problems (Accommodation Disorders)	Near/distance blurred vision, difficulty changing focus, eye strain, headache, avoidance of reading.	Lens flipper exercises, therapeutic lenses, computer programs.
Eye Teamwork Problems (Binocular/Convergence)	Eye strain, headache, double vision/blurriness during near work, distractibility, difficulty reading.	Vergence exercises (Brock String, Pencil Push-ups, etc.), prismatic lenses (in some cases), computer programs.
Visual Field Losses (Hemianopsia, etc.)	Inability to see a portion of the visual field, bumping into objects, difficulty reading.	Training in scanning techniques, prismatic lenses (field expansion/shifting), visual search exercises.
Visual Processing/Perceptual Disorders	Difficulty recognizing objects/faces, impaired depth perception, visual neglect, reading/writing/math difficulties.	Perceptual exercises (discrimination, memory, spatial), visual-motor integration activities, computer programs.
Light Sensitivity (Photophobia)	Discomfort in bright light, glare, headache.	Special filtered/tinted therapeutic lenses, desensitization exercises to light.
Visual Balance/Coordination Issues	Dizziness, lightheadedness, imbalance, tendency to fall, discomfort in moving environments.	Visual-vestibular integration exercises, prismatic lenses, visual-motor coordination and balance activities.

This table shows how VRT can address the wide variety of vision problems that can arise after a brain injury. It can be a useful starting point to see if the symptoms you are experiencing match one of these problems and to get an idea of how VRT might help you.

Can Dizziness and Balance Problems Be Visually-Induced?

Dizziness (vertigo) and balance problems are very common after a brain injury and seriously affect quality of life. Although people with such complaints usually consult an ENT specialist or a Neurologist, the fact that the source or trigger of the problem could be a disorder in the visual system is often overlooked.

The Role of the Visual System in Balance

Our body’s ability to maintain balance relies on a complex inter-system collaboration. Our brain constantly analyzes and integrates information from three primary sensory systems to understand our position and movement in space:

The Vestibular System: Located in the inner ear, this system detects the movements of the head (turning, tilting) and its position relative to gravity. It forms the basis of our sense of balance.
The Proprioceptive System: Through special receptors in our muscles, tendons, and joints, this system informs the brain about the position of our body and where our limbs are in relation to each other.
The Visual System: Through our eyes, it provides a visual map of the world around us. Visual reference points like the horizon line and vertical and horizontal lines help us to adjust our posture and balance. It also allows us to understand whether we are moving or if the objects around us are moving.

Under normal conditions, the information from these three systems is consistent with each other, and the brain processes this information seamlessly to maintain our balance.

The Interaction Between Brain Injury and the Balance Systems

A brain injury (stroke, TBI, etc.) can damage any of these three balance systems or the brain regions that process and coordinate the information from them (for example, the cerebellum, the brainstem). This can lead to a mismatch or conflict between the systems. The negative effects on balance can become particularly pronounced when the visual system is affected. For example:

Double vision (Diplopia): When the brain receives two different images, spatial orientation can be disrupted.
Eye movement disorders: Involuntary eye movements (like nystagmus) or the inability to fixate on a target can lead to a sensation that the world is moving or shaking.
Visual field loss: Not being able to see a part of the surroundings reduces the visual reference points needed to maintain balance.
Visual processing problems: Impaired depth perception, misperception of motion, or slow processing of visual information sends faulty signals to the brain.
Visual overload: Crowded or moving environments (shopping malls, traffic, patterned floors) can overstimulate the visual system, causing dizziness or disorientation.

When the brain tries to combine this faulty or conflicting information from the visual system with the information from the vestibular and proprioceptive systems, it experiences “confusion.” This leads to the symptoms that the person experiences as dizziness (vertigo), lightheadedness, nausea, imbalance, and disorientation. Such visually-induced balance problems can restrict a person’s mobility and increase the risk of falling. Therefore, when investigating the underlying causes in people experiencing dizziness after a brain injury, it is essential that the visual system is also evaluated.

VRT’s Contribution to Visual-Vestibular Integration

Vision Rehabilitation Therapy (VRT) can play an important role in the treatment of dizziness and balance problems by improving the visual system functions that were disrupted after a brain injury and by re-establishing the harmony between the visual system and the other balance systems (visual-vestibular integration). VRT’s contributions in this area include:

Improving Eye Movement Control: The accuracy, fluency, and coordination of eye movements are improved with tracking, saccade, and vergence exercises. This helps to send more stable and reliable visual information to the brain.
Correcting Binocular Vision: If there are double vision or eye alignment problems, the goal is to get both eyes working together in harmony with prismatic lenses and/or exercises. This contributes to balance by improving spatial perception and depth perception.
Developing Visual Processing Skills: Exercises for visual perception, visual memory, and visual-spatial awareness enable the brain to interpret visual information more accurately.
Increasing Tolerance to Visual Motion and the Environment: With special exercises and sometimes filtered lenses, the person’s sensitivity to moving objects or complex visual environments (supermarkets, crowds) is reduced, and the likelihood of experiencing dizziness in such environments is decreased.
Visual-Vestibular Integration Exercises: Exercises like gaze stabilization (focusing on a fixed target during head movements) directly target and improve the coordination between the visual and vestibular systems.

Through these methods, VRT reduces the faulty signals originating from the visual system and enables the brain to use visual information more accurately to maintain balance. As a result, a significant reduction in the symptoms of visually-induced dizziness, lightheadedness, and imbalance can be achieved.

Methods Used in Vision Rehabilitation Therapy (VRT)

Vision Rehabilitation Therapy (VRT) is a holistic and personalized treatment approach for the various vision problems that arise after a brain injury. Rather than a single method, it involves a combination of various techniques and tools tailored to the patient’s needs. It is important to understand that VRT is not just simple “eye exercises” but also encompasses modern tools such as special lenses, prisms, filters, and computer technology.

Every brain injury and every patient is unique. Therefore, VRT programs are not standardized; they are planned completely individually, taking into account the type and location of the patient’s injury, the specific visual symptoms they are experiencing, their age, general health status, motivation, and goals in daily life. The treatment plan is based on the findings obtained from a comprehensive neuro-optometric evaluation. In light of this evaluation, the therapist determines the most appropriate exercises, lenses, and other methods and adjusts the program according to the patient’s progress throughout the treatment.

Therapeutic Lenses and Prisms

Special eyeglass lenses used in VRT are important tools for supporting or re-training the visual system. These specially cut lenses shift the location of the image on the retina by changing the direction of the light. Their main purposes are:

Correcting double vision (Diplopia): They bring the two images created by the misalignment of the eyes on top of each other, allowing a single image to be perceived.
Compensating for eye alignment problems (Phoria/Tropia): They increase visual comfort by reducing the drift in the natural resting position of the eyes.
Managing visual field loss: They can increase a person’s peripheral awareness by shifting the image from the lost area of the visual field to an intact area.
Assisting with visually-induced balance problems: They can support the balance system by altering spatial perception.

Prisms can be permanently ground into the eyeglasses or can be used in the form of temporary, press-on Fresnel prisms.

Therapeutic Lenses/Filters: Unlike standard prescription lenses, these are lenses that target specific visual functions:

Focusing (Accommodation) support: Special plus (+) power lenses or bifocal/progressive lenses can be used to help patients who have difficulty focusing at near.
Filters: Filters of specific colors are used to reduce light sensitivity (photophobia), to increase contrast sensitivity, or to reduce visual stress.

Specific Eye Exercises (Tracking, Focusing, Coordination)

These exercises, which form the basis of VRT programs, aim to improve eye-brain coordination and to regain lost visual skills:

Pursuit and Saccade Exercises: They improve the ability of the eyes to smoothly follow a moving object (pursuit) and to make fast, accurate jumps between different points (saccade). They are critically important for reading fluency, sports performance, and general visual attention.
Accommodation (Focusing) Exercises: They increase the ability to focus clearly at different distances and to sustain that focus (accommodative facility and stamina). Lens flippers (rapidly switching between different power lenses) are often used for this purpose.
Eye Teaming (Vergence) Exercises: They improve the ability of both eyes to move inward (convergence) and outward (divergence) together and to maintain that position (fusional vergence). Exercises like the Brock String and Pencil Push-ups are commonly used, especially in the treatment of convergence insufficiency (CI).

Computer-Assisted Programs

With the advancement of technology, the use of computer-based programs in VRT has increased. These programs offer interactive exercises that target many different skills, such as eye movements, focusing, vergence, visual perception, and reaction time. They provide the ability to objectively measure the patient’s performance and to track progress. They can make the therapy more engaging and motivating. They also allow for some exercises to be done at home. There is also special software developed for specific conditions (e.g., adult amblyopia), such as NeuroVision™.

Visual-Motor Activities

These activities aim to integrate visual perception with motor skills. The goal is to improve the brain’s ability to coordinate what it sees with the body’s movements. Examples may include:

Drawing, copying shapes, solving mazes.
Creating patterns with blocks, doing puzzles.
Games that require hand-eye coordination, such as throwing or catching a ball.
Visual-balance exercises performed on balance boards or with other equipment.

This multi-faceted approach enables VRT to effectively intervene in the complex vision problems that arise after a brain injury.

Why is a Comprehensive Evaluation Necessary for a Correct Diagnosis?

For the vision problems that arise after a brain injury to be treated effectively, the first and most important step is a correct diagnosis. However, these problems can often be missed in standard eye examinations.

A routine eye examination usually focuses on checking the structural health of the eye (for conditions like cataracts, glaucoma, retinal diseases) and on measuring visual acuity to determine the need for glasses or contact lenses. Although these examinations are extremely important, they may not be sufficient to thoroughly evaluate the functional vision problems that develop after a brain injury (such as how the eyes work together, how they focus, how they coordinate their movements, and how the brain processes visual information).

Even if a person receives a result of “eyes are healthy” or “visual acuity is normal” in a standard examination, they can continue to experience serious complaints such as difficulty reading, double vision, inability to track objects, impaired depth perception, sensitivity to light, or visually-induced dizziness. This is because the problem does not lie in the eye itself, but in the communication between the eyes and the brain or in the damage to the brain’s visual processing centers.

The Importance and Content of a Neuro-Optometric Evaluation

This is where a comprehensive Neuro-Optometric Evaluation comes in. This evaluation is performed by an ophthalmologist or optometrist specializing in the field of neuro-optometry and goes far beyond a standard examination to investigate in detail the functional effects of a brain injury on the visual system. This evaluation not only diagnoses what the problem is but also lays the foundation for creating a personalized and effective Vision Rehabilitation Therapy (VRT) program.

This evaluation typically includes:

Detailed Patient History: The patient’s symptoms, the type and time of the brain injury, the difficulties encountered in daily life, their general health status, and treatment goals are discussed in detail.
Standard Eye Examination: Visual acuity, refractive errors (need for glasses), and ocular health (intraocular pressure, retina, optic nerve, etc.) are checked.
Binocular Vision Assessment: How well the two eyes work together is tested. This includes the alignment of the eyes (cover test, measurement with prisms), the ability of the eyes to turn inward when focusing at near (convergence – with the NPC test), the ability to fuse the images from both eyes in the brain (fusion), and three-dimensional vision (stereopsis).
Accommodation (Focusing) Assessment: The power, speed, and flexibility of the eyes’ focusing at different distances are measured. Methods like lens flippers or retinoscopy are used.
Oculomotor (Eye Movements) Assessment: The speed, accuracy, and fluency of the eyes’ ability to follow a moving object (pursuit) and to jump from one point to another (saccade) are evaluated. Standardized tests like the DEM test may be used.
Visual Field Test: Peripheral vision loss (like hemianopsia) suspected especially after a stroke or TBI is detected.
Visual Processing and Perception Tests: The focus is on how the brain interprets visual information. Skills such as visual discrimination, visual memory, figure-ground perception, visual closure, and visual-motor integration are evaluated with various tests and activities.
Visual-Vestibular Interaction Assessment: In patients with dizziness or balance problems, how vision is affected during head movements and the contribution of the visual system to balance are examined.

This comprehensive evaluation reveals the specific underlying causes of the visual difficulties experienced after a brain injury. The data obtained makes it possible to design a targeted and effective VRT program that is best suited to the patient’s individual needs. Therefore, it is of great importance for people experiencing vision problems after a brain injury to contact an ophthalmologist for a neuro-optometric evaluation for a correct diagnosis and treatment.

Complaints such as double vision, reading difficulty, focusing problems, light sensitivity, balance problems, or visually-induced dizziness experienced after a brain injury can significantly affect a person’s independence and quality of life. However, it is possible to overcome these challenges. Vision Rehabilitation Therapy (VRT) is an effective treatment method that takes advantage of the brain’s neuroplasticity ability to help in the re-learning and development of damaged visual skills.

It should not be forgotten that the correct diagnosis of such functional vision problems usually requires going beyond a standard eye examination. A comprehensive neuro-optometric evaluation that examines in detail how the eyes work together, their focusing and tracking abilities, the visual field, and how the brain processes visual information is critically important for determining the source of the problem and creating the most effective treatment plan. The goal is to achieve a clearer, more comfortable, and more efficient level of vision with a VRT program that is personalized as a result of this evaluation.

If you or a loved one are experiencing visual complaints similar to those mentioned above after a stroke, traumatic brain injury, cerebral palsy, MS, or another neurological condition, you can contact Dr. Hatice Semrin Timlioğlu İper to get more information about your situation and to schedule a personalized neuro-optometric evaluation. Do not hesitate to take the first step to rediscover your visual potential and to improve your quality of life.

The text and images on our site are for informational purposes only. They do not substitute for diagnosis and treatment, nor do they carry any legal responsibility.