Eye Diseases and Comprehensive Treatment Guide
Our eyes are the most important connection point we establish with the world. Protecting their health is the key to maintaining a quality life. Here is a comprehensive guide on the most common eye diseases, their causes, symptoms, and current treatment methods.
Myopia (Nearsightedness)
Myopia is a common refractive error where light focuses in front of the retina, causing distant objects to appear blurry while nearby objects are seen clearly. It is typically associated with the eyeball being longer than normal or the cornea being too steeply curved. It can progress, usually starting at a young age, and genetic factors play a significant role. As the degree of myopia advances, the risk of retinal detachment may also increase in some patients.
Treatment Methods: Myopia treatment generally focuses on improving visual acuity. The most common treatments are the use of glasses or contact lenses. For adults seeking permanent solutions, Laser Eye Surgeries (such as LASIK, PRK, ReLEx SMILE) are available. These surgical methods reshape the cornea to allow light to focus correctly. For high degrees of myopia, intraocular lens implantation can also be an option.
Hypermetropia (Farsightedness)
Hypermetropia, in contrast to myopia, is a refractive error characterized by light focusing behind the retina. This condition is usually caused by the eyeball being shorter than normal or the cornea not being curved enough. Mild hyperopes may be able to use their eye muscles to focus when young, but this can lead to eye strain and headaches. As they age, their near vision ability deteriorates further.
Treatment Methods: Treatment begins with vision correction aids, similar to myopia. Glasses and contact lenses use positive (converging) lenses to correctly focus light onto the retina. Surgically, laser surgeries (LASIK or PRK) can correct hyperopia by increasing the corneal curvature. Especially in individuals over 40, when combined with presbyopia (age-related near vision loss), advanced intraocular lens solutions like multifocal lenses may be considered.
Astigmatism
Astigmatism is a complex refractive error caused by the cornea or lens having a cylindrical or irregular shape instead of a spherical one. This irregularity causes different light rays entering the eye from different angles to focus at different points, resulting in images appearing blurry, shadowed, or distorted at all distances. Astigmatism is usually congenital and is often seen with other refractive errors (myopia or hyperopia).
Treatment Methods: Astigmatism can be effectively treated with toric lens glasses or special toric contact lenses that correct the difference in refraction between the meridians. For those seeking a permanent solution, laser surgery (LASIK or PRK) aims to reshape the cornea to eliminate the surface irregularity. In some advanced cases, especially high or irregular astigmatism, intracorneal rings or special intraocular lenses may also be used.
Cataract (Clouding of the Eye Lens)
A cataract is the gradual clouding and loss of transparency of the natural lens located inside the eye. This condition is most commonly seen as a natural result of aging, but factors like trauma, diabetes, or long-term steroid use can also cause cataracts. Symptoms include blurry vision, fading colors, decreased night vision, and light sensitivity (glare). If left untreated, it leads to serious vision loss.
Treatment Methods: The only effective permanent treatment for cataract is the surgical removal of the cloudy natural lens and its replacement with an artificial, clear intraocular lens (IOL). Modern cataract surgeries (phacoemulsification method) are minimally invasive and usually brief. Today, multifocal or toric lenses that can correct the patient’s refractive errors (miyopi, astigmatizma) are also available.
Glaucoma (Eye Pressure)
Glaucoma is a progressive disease that permanently damages the optic nerve, typically due to dangerously elevated intraocular pressure (IOP). When the optic nerve is damaged, permanent and irreversible visual field loss occurs. The most common type, open-angle glaucoma, is known as the “silent thief” because it initially causes no pain or symptoms. Early diagnosis and regular monitoring are crucial. If left untreated, it can progress to total blindness.
Treatment Methods: Glaucoma treatment fundamentally focuses on lowering intraocular pressure. Initially, eye drops are used; these either decrease the production of eye fluid or increase its drainage. In patients who do not respond to medication or whose disease progresses, laser treatment (e.g., selective laser trabeculoplasty – SLT) or surgical operations (e.g., trabeculectomy) may be applied to facilitate fluid flow. Treatment does not repair the damage to the optic nerve but aims to halt its progression.
Age-Related Macular Degeneration (AMD/Yellow Spot Disease)
Age-Related Macular Degeneration (AMD) is a chronic eye disease that affects the macula, the central part of the retina, leading to central vision loss. It usually occurs after the age of 50. There are two main types: Dry type (progresses slower) and Wet type (causes faster and more severe vision loss). AMD makes activities requiring fine detail, such as reading, driving, and face recognition, difficult. Smoking and genetic predisposition are the biggest risk factors.
Treatment Methods: There is currently no known cure for Dry type AMD, but special AREDS or AREDS2 vitamin supplements are recommended to slow the disease’s progression. For Wet type AMD (neovascular type), intraocular injections (anti-VEGF drugs) that inhibit the growth of abnormal blood vessels in the macula are the main treatment method. These injections are repeated regularly to stop the leakage of blood vessels and slow down vision loss, sometimes even partially reversing it.
Diabetic Retinopathy
Diabetic Retinopathy is a serious complication caused by uncontrolled high blood sugar damaging the small blood vessels in the retina. It usually shows no symptoms in the initial stages, but as it progresses, vision blurriness, fluctuating vision, or sudden and severe vision loss can occur. The duration of diabetes and the degree of blood sugar control directly affect the risk and severity of the disease. The cornerstone of treatment is good diabetes management.
Treatment Methods: Diabetes control is vital for the early stages of the disease. In more advanced stages, laser photocoagulation (laser applied to the retina) or anti-VEGF intraocular injections (to reduce macular edema) are used to stop the leakage or growth of abnormal blood vessels. In very advanced and complex cases, surgical operations called vitrectomy may be necessary to clear blood or scar tissue reaching the retina.
Retinal Detachment (Separation of the Retina)
Retinal detachment is a condition where the retina (the light-sensitive tissue layer at the back of the eye) separates from its underlying supportive tissue layer. This separation prevents the retina from receiving oxygen and nutrients, which, if left untreated, can rapidly lead to permanent vision loss. It usually occurs due to tears in the retina caused by high myopia, trauma, or aging, where fluid lifts the retina. Flashes of light, black spots (floaters), and a sensation of a curtain over the vision are typical symptoms.
Treatment Methods: Retinal detachment requires emergency surgical intervention. The surgical methods used include: Vitrectomy (removal of the gel substance inside the eye and placing the retina back in position), scleral buckle (placing a silicone band on the outer wall of the eye to close the retinal tear), or pneumatic retinopexy (injecting gas into the eye to close the tear). The method applied depends on the type and extent of the detachment.
Keratoconus
Keratoconus is a progressive eye disease where the cornea, which should normally be round, gradually thins and bulges outwards into a cone shape. This corneal shape distortion leads to severe irregular astigmatism and progressive vision reduction. It usually starts in adolescence and progresses until the twenties. Chronic eye rubbing and genetic predisposition can accelerate the disease’s progression.
Treatment Methods: In the early stages, visual acuity can be improved with special contact lenses (rigid gas permeable or scleral lenses). The main treatment applied to halt the disease’s progression is Corneal Cross-linking (CXL). This procedure strengthens the corneal tissue, preventing further thinning and shape distortion. In advanced cases, corneal transplant (keratoplasty) is the final treatment option to restore vision.
Optic Neuritis (Inflammation of the Optic Nerve)
Optic Neuritis is the inflammation of the optic nerve, which carries visual information from the eye to the brain. This condition typically manifests with symptoms such as sudden decrease in visual acuity, fading of color vision (especially the perception of red being muted), and eye pain that increases with eye movement. It can often be the first symptom of neurological diseases like Multiple Sclerosis (MS) or occur after viral infections.
Treatment Methods: The primary goal of treatment is to reduce inflammation. It usually begins with high-dose intravenous corticosteroids (cortisone), which can speed up recovery and reduce the severity of vision loss. In many patients, visual ability spontaneously improves within a few weeks. However, if there is an underlying neurological disease (like MS), the treatment for that disease must also be planned simultaneously. Treatment is important to prevent permanent vision loss.
Retinitis Pigmentosa (Disease with No Permanent Cure)
Retinitis Pigmentosa (RP) is a genetic disorder where the photoreceptor cells (light-sensitive cells) of the retina progressively degenerate and die over time. The disease usually begins at a young age, with the first symptom being night blindness. Subsequently, the visual field gradually narrows (tunnel vision). Unfortunately, there is currently no definite and permanent cure for this progressive genetic disease.
Treatment Methods: Current treatment approaches for RP focus on slowing progression and preserving remaining vision. High-dose Vitamin A supplementation may slow progression in some patients. Experimental and clinical studies, such as genetic therapies (gene therapy), stem cell transplants, and bionic eyes (retinal prostheses), are ongoing and offer hope for future RP treatments. Regular monitoring and low vision aids are recommended for patients.