Glaucoma is known as the "silent thief of sight" because it slowly damages the optic nerve without symptoms until a large part of vision is lost. It is a leading cause of avoidable blindness preventable by early detection. The ClinicsJo Editorial Team offers this important guide to protect your eyes.
What Is Glaucoma?
Glaucoma is a group of diseases that damage the optic nerve, which carries the image from the eye to the brain, often due to raised fluid pressure inside the eye. This damage is gradual and irreversible, but early treatment can halt it and preserve remaining vision.
Types of Glaucoma
- Open-angle glaucoma: the most common, developing slowly without early symptoms.
- Angle-closure glaucoma: can occur acutely with severe pain — an emergency.
- Normal-tension glaucoma and congenital and secondary types.
Symptoms
The common open-angle type causes no early symptoms, but with progression:
- Gradual loss of peripheral (side) vision first.
- Narrowing visual field, like looking through a tunnel.
The acute angle-closure attack has clear, emergency symptoms:
- Sudden severe eye pain and headache.
- Red eye, blurred vision, and halos around lights.
- Nausea and vomiting.
Risk Factors
- Raised eye pressure.
- Age (over 40).
- Family history of glaucoma.
- Diabetes and high blood pressure.
- Severe nearsightedness and prolonged steroid use.
How Is It Diagnosed?
- Eye pressure measurement.
- Optic nerve examination and imaging.
- Visual field test to detect early loss.
- Corneal thickness and eye-angle examination.
Treatment
- Eye drops: first line, used daily to lower pressure.
- Laser: to improve fluid drainage in certain types.
- Surgery: to create a new drainage path when needed.
Treatment preserves remaining vision but cannot restore what is lost, so early detection is crucial.
Medical tip: using glaucoma drops daily is vital even without symptoms. Stopping them because "the eye looks fine" can cause permanent, unrecoverable vision loss.
When to See a Doctor
Have regular eye exams, especially with age or risk factors. Seek emergency care for sudden severe eye pain with redness, blurred vision, and nausea — it may be an acute glaucoma attack.
Frequently Asked Questions
Is glaucoma the same as cataract?
No, cataract is a treatable clouding of the lens, while glaucoma is irreversible optic nerve damage.
Does glaucoma cause blindness?
It can if neglected, but early detection and treatment prevent vision loss in most cases.
The Importance of Adherence
Glaucoma medications only work when used every day on schedule, even when no symptoms are felt. Vision lost to glaucoma cannot be recovered, so the entire goal of treatment is to preserve what remains. Setting daily reminders, linking drops to a routine (breakfast, bedtime), and keeping all scheduled follow-ups significantly improve long-term outcomes.
For an eye exam and early detection, book with an ophthalmologist on ClinicsJo.
