Overview
Glaucoma is a group of eye conditions that damage the optic nerve, usually because pressure inside the eye is too high. It steals side vision so slowly that most people do not notice until sight is already lost, which cannot be regained. This is why it is called the silent thief of sight. Early detection through a simple eye-pressure check and regular drops can protect the vision you still have.
Symptoms
- Usually no early symptoms — found on a routine eye check
- Gradual loss of side (peripheral) vision
- Difficulty seeing in dim light
- In sudden (acute) glaucoma: severe eye pain and blurred vision
- Seeing coloured halos around lights
When to see a doctor
Get regular eye-pressure checks after age 40, or earlier with a family history. Start prescribed drops promptly and never stop them without advice.
Emergency — call 108 or go to the nearest hospital
- Sudden severe eye pain with blurred vision, headache, nausea and halos around lights — acute glaucoma, go to an eye hospital immediately
Causes
A build-up of fluid pressure inside the eye that damages the optic nerve. Risk rises with age, family history, diabetes and high short-sightedness.