Astigmatism is a common vision defect arising due to irregular curvatures of the cornea or eye lens. This condition results in the image not being precisely focused on the retina, causing blurred or distorted vision. Affecting millions of people worldwide, astigmatism can occur in every age group, although its symptoms and effects may vary from person to person. In this article, we will examine the symptoms, causes, diagnosis methods, and treatment options of astigmatism in detail.
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What is Astigmatism?
Astigmatism is a vision disorder resulting from the irregular curvature on the surface of the cornea (the transparent layer at the front of the eye) or the eye lens. In a normal eye, the corneal surface is curved evenly, and the image is focused correctly onto the retina. However, in astigmatism, the curvature of the cornea is irregular, and light rays focus at different points. This causes objects to be seen as blurry, shadowed, or distorted at both near and distant ranges.
Astigmatism can often be congenital, or it can develop as a result of corneal injuries, surgical interventions, or eye diseases.
What Causes Astigmatism?
The formation of astigmatism can be linked to several different causes. Fundamentally, irregular curvatures on the surface of the cornea (located at the front of the eye) or the eye lens (located inside) cause astigmatism. A normal cornea or lens ensures that the image is focused clearly onto the retina by curving equally and smoothly. However, due to the irregular curvature of these structures in astigmatism, light focuses at different points, resulting in blurred or distorted vision. Astigmatism can be a congenital trait, or it can also develop as a result of trauma, surgeries, or diseases affecting the cornea, such as keratoconus. Additionally, individuals with a family history of astigmatism have a higher probability of having this vision defect. Therefore, regular eye examinations are critically important for the early detection and treatment of astigmatism.
- Genetic Factors: Astigmatism is a refractive error that can be inherited genetically. The probability of this condition occurring is higher in individuals whose family members have astigmatism.
- Congenital Corneal Structure: Some individuals have irregular curvatures on the corneal surface from birth. This situation causes astigmatism symptoms to appear at an early age.
- Eye Injuries and Surgical Interventions: Corneal injuries or some surgical interventions performed on the eye can cause the development of astigmatism. Irregularities can especially occur after interventions on the cornea.
- Diseases Like Keratoconus: Certain eye diseases, such as keratoconus, which are characterized by the thinning and advanced deformation of the cornea, can also cause astigmatism.
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What Are the Symptoms of Astigmatism?
Astigmatism symptoms can vary depending on the degree of the astigmatism, the irregularity of the cornea, and the presence of other vision disorders. Common astigmatism symptoms include the following:
- Blurred and Distorted Vision: The most common symptom of astigmatism is blurred and distorted vision. Patients find it difficult to see objects clearly, and images are often perceived as blurry or shadowy.
- Difficulties with Night Vision: Night vision is significantly affected in astigmatism patients. Seeing halos, glares, and scattering around headlights, especially during night driving, is a frequently experienced problem.
- Eye Strain and Headaches: Due to astigmatism, one may constantly need to squint to see clearly. This can lead to continuous strain in the eye muscles and headaches. These symptoms become more pronounced, especially during prolonged computer use or reading.
- Need to Squint: Individuals with astigmatism often squint to try to clarify the image. This habit can cause wrinkles around the eyes and chronic eye strain.
How is Astigmatism Diagnosed?
Astigmatism is diagnosed based on a detailed and comprehensive eye examination. If individuals experiencing astigmatism symptoms consult an ophthalmologist, the degree of astigmatism and the irregularities in the cornea are determined through various tests. Ophthalmologists utilize methods such as the refraction test (autorefractometer), visual acuity test, and keratometry and corneal topography, which accurately measure corneal curvatures, to evaluate patients’ visual acuity and clearly determine the cause of the vision impairment. Through these tests, the severity of astigmatism and which area of the eye is affected are clearly identified, and the most appropriate treatment method is decided. Early diagnosis of astigmatism is of great importance in preventing vision problems that may arise later. Therefore, regular eye check-ups should not be neglected. The tests applied by ophthalmologists include the following:
- Visual Acuity Test: In this test, the patient is asked to read letters and symbols from a certain distance. Visual clarity is evaluated, and astigmatism symptoms are easily detected.
- Autorefractometer (Refraction Test): The refractive power of the eye is measured with an autorefractometer device, and the degree of astigmatism is determined. This test is one of the most commonly used methods for determining the degree of astigmatism.
- Keratometry and Corneal Topography: With Keratometry, the curvatures on the corneal surface are measured precisely. Corneal topography generates a detailed map of the corneal surface, allowing irregularities in the cornea to be clearly visualized.
What Are the Treatment Methods for Astigmatism?
Astigmatism treatment is determined individually based on the person’s age, daily life habits, and the degree of astigmatism. The main goal of the treatment is to ensure the patient gains clearer vision by eliminating the vision impairment caused by the irregular curvatures of the cornea. Frequently applied methods for astigmatism include the use of glasses, specially manufactured toric contact lenses, laser surgery (methods like LASIK, PRK, SMILE), and orthokeratology (night lenses). The ophthalmologist, in light of the data obtained from comprehensive examinations, determines the most suitable treatment method for the person’s eye structure and lifestyle, thereby improving both the quality of vision and the quality of life significantly. Regular follow-ups and adhering to the treatment plan recommended by the doctor are critically important for the success of astigmatism treatment.
- Use of Glasses: The simplest and most common method in astigmatism treatment is the use of special glasses with cylindrical lenses. Glasses provide clear vision by correcting the irregular corneal curvature.
- Contact Lenses: Toric contact lenses are specially designed to correct astigmatism. The advantage of lenses is that they offer a wider field of view and are an aesthetic alternative to wearing glasses. Scleral lenses and hybrid lenses are preferred, especially for high astigmatism.
- Laser Eye Surgery (LASIK, PRK, SMILE): Laser surgery is one of the most effective ways to permanently correct astigmatism. Astigmatism is completely or largely eliminated as a result of the cornea being reshaped by the laser. LASIK, PRK, and SMILE methods are chosen according to the eye structure and the degree of astigmatism.
- Orthokeratology (Night Lenses): Night lenses temporarily correct astigmatism by reshaping the cornea during sleep. They provide clear vision throughout the day, but the effect is temporary, and the lenses must be used regularly.
| Types of Laser Eye Surgery | Laser Eye Surgery Details |
|---|---|
| LASIK Eye Laser Surgery | LASIK (Laser-Assisted in Situ Keratomileusis) is one of the most commonly used laser eye surgery methods for correcting vision defects. In this procedure, the shape of the cornea is changed, enabling light to focus correctly on the retina, thus achieving clear vision. |
| PRK Eye Laser Surgery | PRK (Photorefractive Keratectomy) is a laser eye surgery method developed before LASIK and preferred for specific patient groups today. In this procedure, the outermost layer of the cornea (epithelium) is completely removed, and the underlying tissue is treated with a laser to correct the shape of the cornea. |
| SMILE Laser Eye Surgery | SMILE Laser Surgery (Small Incision Lenticule Extraction) is a modern laser eye surgery method used in the treatment of refractive errors such as myopia and astigmatism. This technique is performed by making a minimal incision in the cornea and removing a small piece of tissue called a lenticule. |
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Which treatment option to choose for astigmatism varies depending on the individual’s needs and expectations. For patients with low-grade astigmatism who are not bothered by wearing glasses, specially designed glasses, which are an economical and simple solution, may suffice. For individuals with a more active lifestyle who prefer not to wear glasses, toric contact lenses can offer both a comfortable and aesthetic alternative. However, if the aim is to permanently eliminate the astigmatism problem, laser eye surgeries (LASIK, PRK, SMILE) are among the most successful and permanent treatment methods available today. The suitability of laser eye surgery is determined according to the patient’s corneal thickness, general eye health, and the degree of astigmatism. Therefore, to learn the most suitable treatment option for you and to enhance your quality of life, you must consult a specialist ophthalmologist. It is extremely important that you do not neglect your regular eye check-ups in order to increase the success of the treatment and protect your eye health.
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