What is glaucoma? It’s a serious eye disease that damages the optic nerve, often because pressure builds inside the eye. This article explains the causes, symptoms, risk factors, and treatment options in a clear, accessible way, making it a strong health explainer for Google News and organic search. For best SEO performance, the metadata should center on the exact-match keyphrase “what is glaucoma” while naturally incorporating related terms like glaucoma symptoms, glaucoma treatment, and optic nerve damage.
What is glaucoma? Glaucoma is a group of eye diseases that cause permanent damage to the optic nerve, which can lead to vision loss and blindness. It typically occurs when fluid builds up in the front part of the eye, increasing intraocular pressure (IOP) to harmful levels.
Understanding Eye Pressure and Optic Nerve Damage
The eye constantly produces a clear fluid called aqueous humor. In a healthy eye, an equal amount of fluid drains out through an area called the drainage angle. If this system gets blocked, fluid builds up and causes high eye pressure.
The optic nerve acts like an electric cable made of over one million tiny nerve fibers. High internal pressure slowly crushes these fibers. As they die, permanent blind spots develop in your field of vision.
The Two Primary Types of Glaucoma
The disease develops differently depending on how the fluid drainage system fails.
| Feature | Open-Angle Glaucoma | Angle-Closure Glaucoma |
| Prevalence | Most common form | Less common, severe form |
| Mechanism | Drainage angle stays open but clogs slowly like a dirty sink drain | The iris physically slides over and completely blocks the drainage angle |
| Onset | Develops gradually over many years | Can happen suddenly (acute attack) |
| Early Pain | Completely painless | Severe, sudden eye and head pain |
Recognisable Signs and Glaucoma Symptoms
Open-angle glaucoma is often called the “silent thief of sight” because it produces zero warning signs or pain in its early stages. You will not notice changes until significant nerve damage has already occurred.
Conversely, an acute angle-closure attack is a medical emergency. You must see an ophthalmologist immediately if you experience the following acute symptoms:
- Sudden, blurry vision
- Severe eye and forehead pain
- Nausea and vomiting
- Seeing rainbow-colored halos around lights
- Extreme redness in the eye
Key Risk Factors for Developing Optic Nerve Disease
Certain biological and medical factors increase your likelihood of developing this eye condition.
- Age: Being over 40 years old, with risks increasing significantly after age 60.
- Genetics: Having family members who have been diagnosed with the condition.
- Ethnicity: People of African, Hispanic, or Asian heritage have a much higher statistical risk.
- Medical Conditions: Living with diabetes, migraines, high blood pressure, or poor blood circulation.
- Eye Health: Severe nearsightedness, farsightedness, or past physical eye injuries.
- Medications: Long-term use of steroid medications, including prescription eye drops.
Medical Diagnosis and Glaucoma Treatment Options
An eye doctor cannot diagnose this condition with a simple pressure test alone. A comprehensive eye exam is required to measure your exact corneal thickness, check the drainage angle, and map your peripheral vision.
While lost vision cannot be reversed, treatments can successfully lower pressure to stop further nerve deterioration.
Common Eye Care Procedures
- Medicated Eye Drops: Prescribed daily drops either lower the amount of fluid your eye makes or help fluid drain better.
- Laser Trabeculoplasty: A minor laser procedure for open-angle cases that opens up the clogged drainage channels.
- Laser Iridotomy: A procedure for angle-closure cases where a laser creates a tiny hole in the iris to let fluid pass.
- Trabeculectomy Surgery: An operating room surgery where a surgeon creates a new drainage flap under the eyelid.
Protecting Your Long-Term Vision
Because early stages lack obvious indicators, regular screening is your best defense. To learn more about managing your overall optical health and healthy habits, read about how nutrition impacts eye health to support your medical treatments. For further details on clinical studies and financial support, you can review the resource guidelines provided by Prevent Blindness.
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