The correct option is D All of the above
The canal of Schlemm is a channel in the eye that collects aqueous humor from the eye and moves it into the bloodstream. If the canal is blocked, the pressure in the eye can increase, resulting in glaucoma. Glaucoma is a condition that causes damage to the eye's optic nerve. It is associated with a buildup of pressure inside the eye. The increased pressure, called as intraocular pressure, can damage the optic nerve, which transmits images to the brain. If damage to the optic nerve from high eye pressure continues, glaucoma will cause permanent loss of vision. Thus, the correct answer is option D.