CPOT CPOT Ocular Anatomy & Physiology 1 — Questions and Answers
Question 1: Which layer of the cornea is responsible for maintaining corneal transparency through its pump function?
- Epithelium
- Bowman's layer
- Stroma
- Endothelium (Correct answer)
Correct answer: Endothelium
The corneal endothelium pumps excess fluid out of the stroma, keeping it dehydrated and optically clear.
Question 2: The fovea centralis, the area of sharpest central vision, is located within which retinal region?
- Optic disc
- Macula lutea (Correct answer)
- Ora serrata
- Peripheral retina
Correct answer: Macula lutea
The fovea centralis sits at the center of the macula lutea and contains the highest concentration of cone photoreceptors.
Question 3: Which muscle is responsible for constricting the pupil in response to bright light?
- Dilator pupillae
- Ciliary muscle
- Sphincter pupillae (Correct answer)
- Superior oblique
Correct answer: Sphincter pupillae
The sphincter pupillae is innervated by the parasympathetic nervous system and contracts to reduce pupil size (miosis).
Question 4: Aqueous humor is produced by which ocular structure?
- Vitreous body
- Ciliary body (Correct answer)
- Choroid
- Trabecular meshwork
Correct answer: Ciliary body
The ciliary body secretes aqueous humor, which fills the anterior and posterior chambers of the eye.
Question 5: The optic nerve exits the eye through an opening called the:
- Fovea
- Macula
- Optic disc (Correct answer)
- Limbus
Correct answer: Optic disc
The optic disc, also known as the blind spot, is the point where the optic nerve exits the globe and has no photoreceptors.
Question 6: Rod photoreceptors are primarily responsible for which type of vision?
- Color discrimination in bright light
- Fine detail central vision
- Low-light and peripheral vision (Correct answer)
- Depth perception
Correct answer: Low-light and peripheral vision
Rods are highly sensitive to light and are concentrated in the peripheral retina, making them essential for scotopic (dim-light) and peripheral vision.
CPOT CPOT Ocular Anatomy & Physiology 1
Which layer of the cornea is responsible for maintaining corneal transparency through its pump function?