Most common etiolopathogenetic cause of glaucoma is: March 2012: (A) Raised pressure in episcleritic veins, (B) Decreased outflow, (C) Increased formation of aqueous humour, (D) Increased scleral outflow
Answer is B. Ans: B i.e. Decreased outflow A sustained increase in intraocular pressure may be due to increased formation of the aqueous humour, difficulty in its exit, or a raised pressure in the episcleral veins of these, the first & last rarely occur, and it follows that raised intraocular pressure is essentially due to an increased resistance to the circulation of the aqueous at the pupil and/ or its drainage through the angle of the anterior chamber.