Ocular Anatomy and Physiology Questions and Answers Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ocular Anatomy and Physiology Questions and Answers flashcards as text
Which layer of the cornea is responsible for maintaining its dehydrated, transparent state?
Answer: Endothelium
The corneal endothelium actively pumps fluid out of the stroma via ion transport to maintain corneal transparency.
The fovea centralis is located within which anatomical structure?
Answer: Macula lutea
The fovea centralis is the central pit within the macula lutea that provides the highest visual acuity.
Which muscle controls the width of the pupil in bright light conditions?
Answer: Sphincter pupillae
The sphincter pupillae is a circular muscle innervated by parasympathetic fibers that constricts the pupil (miosis) in bright light.
Aqueous humor is primarily produced by which structure?
Answer: Ciliary body epithelium
The nonpigmented epithelium of the ciliary body secretes aqueous humor into the posterior chamber.
The vitreous humor occupies approximately what percentage of the eye's total volume?
Answer: 80%
The vitreous chamber makes up about 80% of the eye's total volume, with the vitreous being a gel-like substance filling it.
Which retinal cells are responsible for color vision?
Answer: Cone photoreceptors
Cone photoreceptors contain photopigments (opsins) sensitive to different wavelengths of light, enabling color discrimination.
The optic chiasm is the anatomical site where which event occurs?
Answer: Nasal retinal fibers cross to the opposite side
At the optic chiasm, only the nasal retinal fibers (carrying temporal visual field information) decussate to the contralateral side.