Ocular Anatomy and Physiology 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 flashcards as text
The vitreous humor occupies which chamber of the eye?
Answer: Vitreous chamber
The vitreous humor fills the vitreous chamber (posterior segment), which is the large cavity behind the lens.
Which layer of the cornea is responsible for most of its refractive power?
Answer: Stroma
The stroma comprises about 90% of corneal thickness and, together with its curvature, contributes most of the cornea's refractive power.
The fovea centralis is located in which part of the retina?
Answer: Macula lutea
The fovea centralis is a small depression at the center of the macula lutea, containing the highest concentration of cones for maximum visual acuity.
What is the primary function of the choroid layer?
Answer: Provide nutrient supply to the outer retina
The choroid is a highly vascular layer that provides oxygen and nutrients to the outer retinal layers, including the photoreceptors.
Which muscle of the iris constricts the pupil (miosis)?
Answer: Sphincter pupillae
The sphincter pupillae muscle, innervated by the parasympathetic nervous system via CN III, constricts the pupil.
The limbus is defined as the junction between which two structures?
Answer: Cornea and sclera
The limbus is the transitional zone between the transparent cornea and the opaque white sclera.
How many extraocular muscles control the movement of each eye?
Answer: 6
Each eye is moved by six extraocular muscles: four rectus muscles (superior, inferior, medial, lateral) and two oblique muscles (superior and inferior).