Ocular Anatomy and Physiology Flashcards
7 cards from real COT 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 flashcards as text
Which layer of the cornea is responsible for approximately 90% of its thickness?
Answer: Stroma
The stroma constitutes about 90% of the corneal thickness and is composed of regularly arranged collagen lamellae.
The canal of Schlemm is primarily involved in:
Answer: Aqueous humor outflow
The canal of Schlemm collects aqueous humor from the trabecular meshwork and drains it into the episcleral venous system.
Which photoreceptors are most densely concentrated in the fovea centralis?
Answer: Cones
The fovea centralis contains only cones at its center, providing the highest visual acuity and color discrimination.
The ciliary body performs which TWO primary functions?
Answer: Produces aqueous humor and controls accommodation
The ciliary body secretes aqueous humor via the ciliary epithelium and controls lens shape for accommodation through the ciliary muscle.
The optic nerve head (optic disc) lacks photoreceptors, creating what clinical finding?
Answer: Physiologic blind spot
The optic disc has no photoreceptors, creating a natural blind spot approximately 15 degrees temporal to fixation.
Bruch's membrane separates the retinal pigment epithelium from which structure?
Answer: Choriocapillaris
Bruch's membrane is a pentalaminar structure between the RPE and the choriocapillaris, important in macular disease pathogenesis.
The posterior chamber of the eye is bounded anteriorly by the iris and posteriorly by the:
Answer: Vitreous face and lens
The posterior chamber lies between the posterior iris surface anteriorly and the anterior vitreous face and crystalline lens posteriorly.