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Glaucoma
is a symptomatic condition, not a disease. The characteristic
physical sign is increased intra ocular pressure (IOP).
A sustained increase in IOP may be due to an increase
in the formation of the aqueous humour, a difficulty
in its exit or a raised pressure in the episcleral veins.
Increase in IOP causes pathological changes in the optic
disk and typical defects in the field of vision and
eventually blindness.
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