ABO NOCE Basic Opticianry Ocular Anatomy and Conditions Questions and Answers 2 — Questions and Answers
Question 1: Which layer of the cornea is responsible for rapid regeneration after injury?
- Bowman's layer
- Stroma
- Epithelium (Correct answer)
- Descemet's membrane
Correct answer: Epithelium
The corneal epithelium regenerates quickly after injury, typically healing within 24–48 hours.
Question 2: The aqueous humor is produced by which ocular structure?
- Choroid
- Ciliary body (Correct answer)
- Iris
- Trabecular meshwork
Correct answer: Ciliary body
The ciliary body's non-pigmented epithelium secretes aqueous humor into the posterior chamber.
Question 3: Drusen deposits found in the macula are characteristic of which condition?
- Diabetic retinopathy
- Glaucoma
- Age-related macular degeneration (Correct answer)
- Retinitis pigmentosa
Correct answer: Age-related macular degeneration
Drusen are extracellular deposits beneath the retinal pigment epithelium and are a hallmark of age-related macular degeneration.
Question 4: Which cranial nerve controls the superior oblique extraocular muscle?
- CN III
- CN IV (Correct answer)
- CN V
- CN VI
Correct answer: CN IV
The trochlear nerve (CN IV) exclusively innervates the superior oblique muscle.
Question 5: The fovea centralis achieves its high visual acuity primarily because it contains a high density of:
- Rods
- Bipolar cells
- Cones (Correct answer)
- Ganglion cells
Correct answer: Cones
The fovea is densely packed with cones and lacks rods, enabling fine detail and color discrimination.
Question 6: A patient with pterygium should be advised about which primary environmental risk factor?
- Low humidity
- UV radiation exposure (Correct answer)
- High altitude
- Chlorinated water
Correct answer: UV radiation exposure
Prolonged ultraviolet radiation exposure is the leading environmental risk factor for pterygium formation.
Question 7: The optic disc is considered 'blind' because it lacks which photoreceptor?
- Both rods and cones (Correct answer)
- Rods only
- Cones only
- Horizontal cells
Correct answer: Both rods and cones
The optic disc has no photoreceptors at all — it is the exit point for the optic nerve fibers.
ABO NOCE Basic Opticianry Ocular Anatomy and Conditions Questions and Answers 2
Which layer of the cornea is responsible for rapid regeneration after injury?