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Glaucoma (Glokom): Causes and Treatment Options
Overview
Glaucoma, also known as Glokom in Turkish, refers to a group of chronic eye diseases that cause progressive damage to the optic nerve—the crucial link between the eye and the brain. This damage is often caused by elevated intraocular pressure (IOP) but can occur even when eye pressure appears normal. Left untreated, glaucoma can lead to irreversible vision loss and, in severe cases, complete blindness.
Often developing without early symptoms, glaucoma has earned the reputation of being the “silent thief of sight.” However, with timely diagnosis and proper treatment, further damage can often be prevented.
What Causes Glaucoma?
The main cause of glaucoma is the buildup of fluid (aqueous humor) in the front part of the eye. This fluid normally flows out through a drainage system, but when this pathway becomes inefficient or blocked, pressure inside the eye increases. This elevated pressure can damage the optic nerve over time.
Main Causes and Risk Factors
· Elevated intraocular pressure (IOP)
· Genetic predisposition / family history
· Age over 60
· Diabetes, hypertension, or cardiovascular disease
· Thin corneas or high myopia (severe nearsightedness)
· Previous eye injury or surgery
· Long-term use of corticosteroid medications
Notably, not all glaucoma patients have high eye pressure. Some may develop optic nerve damage due to poor blood flow or other unknown factors, underscoring the importance of comprehensive eye exams.
Types of Glaucoma
Identifying the type of glaucoma is essential for determining the most effective treatment. Below are the most common forms:
1. Primary Open-Angle Glaucoma (POAG)
The most prevalent type, POAG occurs when the eye’s drainage canals become clogged gradually, leading to increased IOP. It progresses slowly and painlessly, often without noticeable symptoms until significant vision is lost.
2. Angle-Closure Glaucoma
Also known as narrow-angle glaucoma, this form results from a sudden blockage of the drainage angle. It leads to a rapid rise in eye pressure and constitutes a medical emergency, requiring immediate treatment.
3. Normal-Tension Glaucoma
In this type, optic nerve damage occurs despite normal IOP levels. It may be linked to poor optic nerve blood flow or increased optic nerve sensitivity. It’s more common in individuals of Asian descent or with vascular diseases.
4. Congenital Glaucoma
A rare condition present at birth, caused by structural abnormalities in the eye’s drainage system. Symptoms may include cloudy corneas, excessive tearing, and light sensitivity in infants.
5. Secondary Glaucoma
Develops as a complication of other eye conditions, trauma, inflammation (uveitis), tumors, or as a side effect of medications like corticosteroids.
Symptoms to Watch For
Glaucoma often causes no symptoms in the early stages, especially in open-angle types. As the disease progresses, vision loss becomes more noticeable. Be aware of the following signs:
· Gradual loss of peripheral (side) vision
· Tunnel vision in advanced stages
· Blurred or hazy vision
· Eye pain or pressure (especially in angle-closure glaucoma)
· Halos around lights
· Redness in the eye
· Sudden loss of vision (emergency)
· Nausea and vomiting related to eye discomfort
Because vision lost to glaucoma cannot be restored, regular eye exams are critical, particularly for individuals over 40 or with risk factors.
How Is Glaucoma Diagnosed?
Diagnosis requires a thorough eye examination using specialized equipment and testing techniques:
· Tonometry: Measures intraocular pressure.
· Ophthalmoscopy: Evaluates the health of the optic nerve.
· Visual Field Test (Perimetry): Assesses peripheral vision and detects blind spots.
· Gonioscopy: Inspects the drainage angle between the iris and cornea.
· Optical Coherence Tomography (OCT): Provides cross-sectional imaging of the retina and optic nerve to detect structural changes.
These tests not only help diagnose glaucoma but also monitor its progression over time.
Glaucoma Treatment Options
While glaucoma cannot be cured, early and consistent treatment can slow or halt its progression. The primary goal is to lower intraocular pressure and prevent further optic nerve damage.
1. Prescription Eye Drops
Often the first line of treatment. Eye drops reduce IOP by either decreasing fluid production or improving drainage. Examples include:
· Prostaglandin analogs
· Beta blockers
· Alpha agonists
· Carbonic anhydrase inhibitors
2. Oral Medications
When eye drops are insufficient, oral medications (e.g., acetazolamide) may be used short-term to reduce fluid production.
3. Laser Therapy
Laser treatments are minimally invasive and can help improve fluid drainage:
· Laser Trabeculoplasty: Opens the drainage angle (used in POAG).
· Laser Iridotomy: Creates a tiny hole in the iris (used in angle-closure glaucoma).
· Cyclophotocoagulation: Targets the ciliary body to reduce fluid production.
4. Surgical Options
Surgery may be necessary when other treatments fail:
· Trabeculectomy: A flap is created to allow fluid to drain out.
· Aqueous Shunt Implants: Small tubes placed in the eye to redirect fluid.
· Minimally Invasive Glaucoma Surgery (MIGS): Less invasive procedures with fewer complications and quicker recovery.
Living with Glaucoma
Managing glaucoma is a lifelong commitment, but with the right treatment, most patients can maintain good vision and quality of life. Key lifestyle habits include:
· Taking medications as prescribed
· Scheduling regular follow-up eye exams
· Wearing protective eyewear and UV-blocking sunglasses
· Avoiding excessive caffeine (can temporarily raise IOP)
· Maintaining healthy blood pressure and glucose levels
Tip: Glaucoma often affects both eyes, but not always symmetrically. Never assume both eyes are at equal risk. Always monitor both.
