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Glaucoma is a group of eye conditions that affect vision and can often affects both eyes, usually in varying degrees. Glaucoma occurs when the drainage tubes (trabecular meshwork) within the eye become slightly blocked which prevents eye fluid (aqueous humour) from draining properly causing pressure to builds up - intraocular pressure. This can damage the optic nerve (which connects the eye to the brain) and the nerve fibres from the retina (the light-sensitive nerve tissue that lines the back of the eye).
Types of glaucoma