OAT Reading Comprehension Practice Questions - Optometry Admission Test - Reading Comprehension Section Exam

The fovea is the most important structure in the human eye because it provides the highest visual acuity. The passage explains the anatomy of retinal photoreceptors, the biochemical mechanism of phototransduction, and the key structural features of the retina. Vitamin A is essential for photoreception, and deficiency leads to blindness. Rods are more numerous than cones and therefore play a more important role in human vision.