If you have presbyopia, your inflexible lens doesn't adjust to focus light properly, so the point of focus falls behind the retina (bottom image). This makes close-up objects appear blurry

Normal vision (left) becomes blurred as a cataract forms (right).

A layer of tissue at the back of your eye that processes light, pulls away from the tissue around it

The vitreous — a jelly-like material inside your eyes — becomes more liquid. When this happens, microscopic collagen fibers within the vitreous tend to clump together. These bits of debris cast tiny shadows onto your retina, and you perceive these shadows as eye floate

Normal vision (shown left) becomes impaired by a distorted blur with missing areas. With advanced macular degeneration, a blind spot typically forms at the center of your visual field (shown right)

The tear glands (lacrimal glands), located above each eyeball, continuously supply tear fluid that's wiped across the surface of your eye each time you blink your eyes. Excess fluid drains through the tear ducts into the nose.

Symptoms : may lead to blindness

• swell & pain,

• photophoby(intolerance of light),

• vision not clear, retinal detachment,

Causes :

• High fluid pressure inside your eye anterior chamber

• Inherited and/or Ageing Process - > 60 years old has higher risk

Open-angle glaucoma - Normally, fluid (aqueous humor) in the eye flows freely through the anterior chamber and exits through the drainage system (trabecular meshwork). If that system is blocked or isn't functioning well, the pressure inside the eye (intraocular pressure) builds, which in turn damages the optic nerve. With the most common type of glaucoma, this results in gradual vision loss.