The inside of the eyeball contains a fluid called aqueous humor. When a blockage in the channels that drain the eye of excessive fluid occurs there is a gradual rise in pressure with the fluid that cannot escape and this is termed glaucoma. The symptoms of glaucoma are gradual and only noticed when parts of the visual field are affected. If left untreated, glaucoma can lead to blindness.
Sometimes glaucoma can occur rapidly. Symptoms include seeing blue, orange, red, or yellow circles around lights, or foggy vision. People over 40 should regularly visit an optician for pressure tests on the eye.
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