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Glaucoma, commonly known as ocular hypertension, is a serious eye disease that occurs due to an increase in intraocular pressure (IOP) and can lead to vision loss over time. The pressure rises because the fluid inside the eye cannot be drained in a balanced manner, and this condition damages the optic nerve. If left untreated, glaucoma can cause permanent vision loss. Therefore, early diagnosis and correct treatment methods are of great importance.
Table of Contents
Types of Glaucoma
Glaucoma is a disease that can develop through different mechanisms and progresses differently in each individual. Glaucoma, which damages the optic nerve due to elevated intraocular pressure, is divided into different subtypes. These types vary according to their causes, symptoms, and rate of progression. While some types of glaucoma can progress insidiously for years without symptoms, others can cause sudden and severe vision loss. Correctly diagnosing the type of glaucoma is crucial for effectively treating the disease. Here are the most common types of glaucoma and their characteristics:
| Types of Glaucoma (Eye Pressure) | Glaucoma Characteristics |
|---|---|
| Open-Angle Glaucoma | This is the most common type of glaucoma and usually progresses slowly. Pressure increases due to resistance in the drainage channels of the eye’s internal fluid. Symptoms are often unnoticed and the disease may not be detected until advanced stages. |
| Angle-Closure Glaucoma | Also known as narrow-angle glaucoma. The iris, the colored part of the eye, blocks the drainage angle, causing a sudden and severe rise in intraocular pressure. This condition requires immediate medical intervention. |
| Congenital Glaucoma | A type of glaucoma present at birth and seen in infants. It results from the abnormal development of the eye’s drainage system. Symptoms include light sensitivity, enlargement of the eye, and excessive tearing. |
| Secondary Glaucoma | A type of glaucoma that develops due to another disease, injury, or medication use. For example, uveitis (eye inflammation), diabetes, or long-term corticosteroid use can lead to secondary glaucoma. |
| Normal-Tension Glaucoma | A type of glaucoma characterized by optic nerve damage and vision loss despite intraocular pressure being within normal limits. The cause is not fully known but may be related to impaired blood flow to the optic nerve. |
| Pigmentary Glaucoma | It is caused by pigments shedding from the colored part of the eye (iris) and blocking the drainage channels. It is typically seen in young adults, and symptoms may increase with physical activity. |
| Exfoliative Glaucoma | Occurs when flaky material from the eye’s lens capsule blocks the drainage channels. This type of glaucoma generally has a higher intraocular pressure and a more rapidly progressing course. |
| Neovascular Glaucoma | Characterized by the formation of abnormal new blood vessels in the eye’s drainage angle. It is usually associated with underlying diseases like diabetes or retinal vascular occlusions. |
| Uveitic Glaucoma | Develops as a complication of uveitis, which is inflammation of the middle layer of the eye. Inflammation and resulting scar tissue impede the drainage of intraocular fluid, causing a pressure increase. |
| Phacomorphic Glaucoma | Typically occurs in advanced stages of cataract, where swelling of the lens narrows the drainage angle. This leads to an increase in intraocular pressure and usually requires surgical intervention. |
Due to the different types, symptoms, and risk factors of glaucoma, regular eye examinations are of great importance. With early diagnosis and appropriate treatment, the vision loss caused by glaucoma can be prevented or minimized.
Symptoms of Ocular Hypertension (Glaucoma)
Ocular hypertension (glaucoma) is known as a “silent disease” because it may not present symptoms in its early stages. However, as the intraocular pressure increases over time, optic nerve damage occurs, and some symptoms begin to emerge as the disease progresses. Since the recognition of symptoms usually occurs in the late stages, regular eye examinations are vitally important.
Here are the symptoms that may appear in the advanced stages of ocular hypertension:
- Narrowing of the Visual Field: As glaucoma progresses, peripheral (side) vision loss occurs. The patient may have difficulty noticing objects in their surroundings.
- Impaired Night Vision: Difficulty seeing in dim light is experienced, particularly leading to problems with clear vision while driving or in dark environments.
- Eye Pain and Headache: High ocular pressure can lead to a feeling of pressure and pain around the eyes. Severe headaches become prominent, especially in narrow-angle glaucoma.
- Sensitivity to Light (Photophobia): Patients with glaucoma may show extreme sensitivity to bright lights or sunlight.
- Seeing Halos: Seeing colored rings or glare around light sources can indicate that the intraocular pressure is high.
- Blurred Vision: As glaucoma advances, clear vision decreases due to optic nerve damage, and intermittent episodes of blurred vision may occur.
- Sudden Vision Loss: In an acute glaucoma attack, the ocular pressure can rise suddenly, causing severe vision loss that can lead to blindness.
Recognizing the symptoms of ocular hypertension is critical for the early diagnosis of the disease. If any of the above symptoms are experienced, it is necessary to consult an ophthalmologist.
What Causes Ocular Hypertension?
There are multiple factors that can cause an increase in ocular pressure. While some conditions involve a congenital predisposition, others may develop due to environmental or lifestyle-related factors.
- Genetic Predisposition: The risk of ocular hypertension is higher in individuals with a family history of glaucoma. Genetic factors can affect the efficiency of the eye’s fluid drainage system. If one or both parents have glaucoma, regular monitoring of ocular pressure is recommended.
- Advanced Age (Risk Increases After 40): Ocular hypertension is generally seen more frequently after the age of 40. This is because the fluid drainage system in the eye loses its efficiency over time, and the intraocular pressure rises uncontrollably. The risk of glaucoma increases even more in individuals over 65.
- Diabetes Mellitus (Relationship between Diabetes and Glaucoma): Diabetes is one of the most important systemic diseases that increases ocular pressure. Diabetes can cause damage to the eye’s blood vessels, disrupting the circulation of intraocular fluid. Diabetic retinopathy can affect the blood vessels inside the eye, leading to the development of a specific type of glaucoma called neovascular glaucoma. It is very important for diabetic patients to have regular eye examinations because ocular hypertension can progress for a long time without being noticed.
- Ocular Trauma and Injuries: Blows to the eye area can increase intraocular pressure after an accident. Ocular pressure can rise following sports injuries, falls, or surgical interventions. Previous eye surgeries can also affect the flow of fluid within the eye, leading to glaucoma. It is recommended that individuals involved in contact sports such as soccer, boxing, and basketball take precautions to protect their eyes.
- Long-Term Cortisone Use: Steroid-containing medications (cortisone) can increase ocular pressure with long-term use. The risk is higher for individuals using eye drops or inhaled corticosteroids. Individuals using cortisone for long periods due to certain skin diseases, asthma, or rheumatic diseases should have their ocular pressure monitored regularly.
How is Ocular Pressure Measured?
To diagnose ocular hypertension, ophthalmologists perform the following tests:
- Tonometry test: Used to measure intraocular pressure.
- Visual field test: Performed to assess the progression of glaucoma.
- OCT (Optical Coherence Tomography): Detects optic nerve damage.
What Should Ocular Pressure Be?
Normally, intraocular pressure should be between 10-21 mmHg. However, in some individuals, lower or higher levels may also be considered normal.
At What Level is Ocular Pressure Dangerous?
An ocular pressure above 21 mmHg is generally considered risky. A level of 25 mmHg and above increases the risk of developing glaucoma.
Treatment of Glaucoma
Glaucoma is a disease that can cause permanent damage to the optic nerve and lead to vision loss if not diagnosed early. The treatment for glaucoma aims to stop the progression of the disease and to keep the intraocular pressure under control. Different methods are used in glaucoma treatment, and the course of treatment varies depending on the patient’s type of glaucoma, intraocular pressure level, and general health condition.
If symptoms of glaucoma are felt or if one of the risk factors is present, an ophthalmologist should be consulted without delay.
Eye Drops for Ocular Hypertension
The first treatment option is usually eye drops. These medications help to lower intraocular pressure by reducing the production of intraocular fluid or by increasing its drainage. The most commonly used eye drops are:
- Prostaglandin Analogs: Lower ocular pressure by increasing the outflow of intraocular fluid.
- Beta-Blockers: Reduce the production of intraocular fluid.
- Alpha-Adrenergic Agonists: Both reduce fluid production and increase its outflow.
- Carbonic Anhydrase Inhibitors: Lower pressure by reducing the production of intraocular fluid.
- Rho Kinase Inhibitors: Increase the outflow of fluid by relaxing the drainage channels.
Glaucoma Surgery
If eye drops do not provide sufficient results, laser therapy may be applied as the next step. Methods used in laser glaucoma treatment include:
- Selective Laser Trabeculoplasty (SLT): Applied in patients with open-angle glaucoma. Laser beams are used to widen the drainage channels that allow the outflow of intraocular fluid.
- Argon Laser Trabeculoplasty (ALT): Similar to SLT but an older technique.
- Laser Iridotomy: Used in patients with narrow-angle glaucoma. A small hole is created in the iris to correct the circulation of fluid within the eye.
Laser eye treatment is generally painless and is performed as an outpatient procedure. However, in some patients, the effect of the treatment may diminish over time, and the ocular pressure may rise again.
If eye drops and laser therapy are not sufficient, surgical intervention may be necessary. The most common glaucoma surgeries are:
- Trabeculectomy: A new drainage channel is created to lower intraocular pressure. It is preferred in patients with very high ocular pressure or those who do not respond to other treatments.
- Glaucoma Drainage Devices (Shunt Surgery): A small tube is placed in the eye to allow for the drainage of intraocular fluid. It is an effective method, especially in patients with secondary glaucoma.
- Minimally Invasive Glaucoma Surgery (MIGS): A newer, less invasive surgical method. Micro-stents are used to open or widen the drainage channels. The recovery time is shorter, and the risk of complications is lower.
Recovery After Glaucoma Surgery
Glaucoma surgery is a surgical procedure performed to lower intraocular pressure, and the postoperative recovery period can vary from patient to patient. For a successful recovery, postoperative care instructions must be followed carefully.
- Eye Drops Must Be Used Regularly: Postoperative eye drops are prescribed to prevent infection and reduce intraocular inflammation. Drops containing corticosteroids and antibiotics must be used as directed by the doctor. Irregular use of eye drops can negatively affect the success of the surgery.
- Avoid Pressure on the Eye: The eye should not be rubbed, scratched, or pressed. A protective eye shield should be worn, especially during sleep. Bending over, lifting heavy objects, or straining should be avoided as they can increase intraocular pressure.
- Stay Away from Strenuous Exercises: Heavy sports and exercises should be avoided for the first 4-6 weeks. Activities like swimming, weightlifting, and running can increase intraocular pressure. Low-impact exercises like light walking can be done with the doctor’s approval.
- Attend Regular Doctor’s Appointments: A doctor’s check-up within the first week after surgery is mandatory. The intraocular pressure and healing process are monitored at specific intervals during the first month. If there are any unusual symptoms in the postoperative period (severe pain, excessive redness, flashes of light), an emergency doctor’s visit is required.
- Recovery Period: The recovery period is typically between 2-4 weeks. In some patients, full recovery can take up to 6 weeks. Ocular pressure may fluctuate for a period after surgery, so regular follow-up is essential.
Important Note: Mild blurriness and sensitivity in the eye are normal during the postoperative recovery period, but if the pain is severe and vision loss is experienced, an ophthalmologist must be consulted urgently.
What Happens When Ocular Pressure Rises Suddenly?
A sudden increase in ocular pressure can cause severe damage to the optic nerve and lead to vision loss. This situation requires emergency intervention, especially for patients with narrow-angle glaucoma. Symptoms that may occur in case of a sudden rise in ocular pressure:
- Blurred Vision: Patients may suddenly start to see blurry. Vision can be impaired in dim light or under bright light. A narrowing of the visual field (tunnel vision) may be experienced.
- Eye Pain: In cases of a sudden rise in ocular pressure, severe pain can be felt around and inside the eye. As the eye pressure increases, the pain can radiate to the ear and head area.
- Headache and Nausea: High ocular pressure can cause severe headaches. Waking up with a headache, especially in the mornings, can be a sign of high ocular pressure. Nausea and vomiting can be seen in cases of a sudden rise in ocular pressure.
If one or more of the following symptoms are present, an ophthalmologist must be consulted immediately:
- Sudden vision loss
- Severe eye pain and headache
- Swelling and excessive redness in the eye
- Nausea and vomiting
A glaucoma attack is an ocular emergency and can cause permanent vision loss if not treated in a timely manner!
- For more information about glaucoma and to schedule an appointment, you can contact Dr. Hatice Semrin Timlioğlu İper and create an appointment for an eye examination.
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