"I Feel Fine, So My Eyes Must Be Fine"
This is the most dangerous assumption in glaucoma. Unlike a cataract, which gradually blurs your vision, or a red eye, which you notice immediately, glaucoma often gives no warning at all in its early stages. That's why it is called the "silent thief of sight."
What Is Glaucoma?
Glaucoma is a group of eye conditions that damage the optic nerve, the cable that carries images from your eye to your brain. The most common cause is raised pressure inside the eye, though some people develop damage even with normal pressure. Once nerve fibres are lost, they don't grow back.
Can You Lose Vision From Glaucoma?
Yes. Glaucoma can cause permanent vision loss, and in advanced, untreated cases, blindness. The damage is irreversible. Treatment can slow or stop further loss, but it cannot restore vision already lost.
Glaucoma usually affects side (peripheral) vision first. Because the brain fills in the gaps and central vision stays sharp, many people don't notice anything until a large part of their vision is already gone. That's why regular screening is so important.
Types of Glaucoma
- Open-angle glaucoma: The most common type. It develops slowly and painlessly.
- Angle-closure glaucoma: The drainage angle is blocked. It can be sudden (an acute attack) or slow.
- Normal-tension glaucoma: Optic nerve damage occurs even with normal eye pressure.
- Secondary glaucoma: Caused by another condition, injury, inflammation, or long-term steroid use.
Warning Signs
Chronic glaucoma often has none. But an acute angle-closure attack is an emergency:
- Severe eye pain and headache
- Redness and blurred vision
- Rainbow halos around lights
- Nausea or vomiting
If these occur, seek emergency eye care immediately.
Who Is at Higher Risk?
- People over 40
- Those with a family history of glaucoma
- People with high myopia or high hypermetropia
- People with diabetes or high blood pressure
- Long-term steroid users (including some eye drops, creams, and inhalers)
- Those with a past eye injury
How Is Glaucoma Detected?
A comprehensive glaucoma check involves more than a simple eye pressure reading. It usually includes:
- Eye pressure measurement
- Optic nerve examination and imaging (OCT)
- Visual field testing to detect peripheral vision loss
- Corneal thickness measurement
- Examination of the drainage angle
Because pressure alone can be misleading, these tests together give the true picture.
How Is Glaucoma Treated?
The goal is to protect the vision you have by lowering eye pressure and stabilising the optic nerve.
- Eye drops: The most common first step. They must be used regularly, often for life.
- Laser treatment: Helps fluid drain or opens a blocked angle.
- Surgery: Used when drops and laser aren't enough, to create a new drainage route.
The single biggest cause of glaucoma progression is not using drops regularly. Because there are no symptoms, patients sometimes stop treatment. But stopping quietly allows damage to continue.
Living Well With Glaucoma
- Get screened regularly if you're at risk, even if your vision feels normal.
- Use your drops as prescribed, every day.
- Attend follow-up visits and repeat visual field and OCT tests.
- Tell family members, since they are also at higher risk.
- Avoid steroid use without medical advice.
The Bottom Line
Yes, you can lose vision from glaucoma, and the loss is permanent. But it is also one of the most preventable causes of blindness when detected early and treated consistently. Because it hurts nothing and shows no early symptoms, a regular eye check is the only reliable defence. If you're over 40, have a family history, or have a high number, don't wait for symptoms.
If you haven't had a comprehensive eye check, including an optic nerve and visual field assessment, it's worth scheduling one. The team at The Vision Eye Center, a trusted eye clinic in Vile Parle, can screen for glaucoma and guide long-term care. Consulting an experienced glaucoma specialist in Mumbai means detecting the condition early, when treatment protects the most vision.
