COA CERTIFICATION PRACTICE EXAM
2026/2027 QUESTIONS AND ANSWERS
1. Which layer of the cornea is responsible for the majority of its structural strength and
consists of collagen lamellae?
A. Stroma
B. Bowman’s layer
C. Epithelium
D. Descemet’s membrane
Answer: A
Conceptual Explanation: The stroma makes up about 90% of the corneal thickness and
provides structural integrity through organized collagen fibers.
2. A patient with a refractive error where parallel light rays focus behind the retina is said to
have:
A. Myopia
B. Presbyopia
C. Astigmatism
,D. Hyperopia
Answer: D
Conceptual Explanation: In hyperopia (farsightedness), the eyeball is too short or the
cornea too flat, causing the focal point to fall behind the retina.
3. Which of the following drops is a carbonic anhydrase inhibitor used to treat glaucoma?
A. Timolol
B. Dorzolamide
C. Brimonidine
D. Latanoprost
Answer: B
Conceptual Explanation: Dorzolamide is a topical carbonic anhydrase inhibitor that
reduces aqueous humor production.
4. What is the primary function of the ciliary body?
A. Light perception
B. Draining tears into the nasolacrimal duct
C. Production of aqueous humor and accommodation
D. Protecting the macula from UV light
Answer: C
, Conceptual Explanation: The ciliary body produces aqueous humor and contains the
ciliary muscle which controls the shape of the lens for accommodation.
5. The visual condition known as ‘presbyopia’ is primarily caused by:
A. Elongation of the eyeball
B. Loss of elasticity in the crystalline lens
C. Clouding of the crystalline lens
D. Irregular curvature of the cornea
Answer: B
Conceptual Explanation: Presbyopia occurs with age as the lens becomes less flexible,
making it difficult to focus on near objects.
6. Which cranial nerve is responsible for the constriction of the pupil?
A. Cranial Nerve II
B. Cranial Nerve III
C. Cranial Nerve IV
D. Cranial Nerve VI
Answer: B
Conceptual Explanation: The Oculomotor nerve (CN III) carries parasympathetic fibers
that stimulate the sphincter pupillae muscle.
2026/2027 QUESTIONS AND ANSWERS
1. Which layer of the cornea is responsible for the majority of its structural strength and
consists of collagen lamellae?
A. Stroma
B. Bowman’s layer
C. Epithelium
D. Descemet’s membrane
Answer: A
Conceptual Explanation: The stroma makes up about 90% of the corneal thickness and
provides structural integrity through organized collagen fibers.
2. A patient with a refractive error where parallel light rays focus behind the retina is said to
have:
A. Myopia
B. Presbyopia
C. Astigmatism
,D. Hyperopia
Answer: D
Conceptual Explanation: In hyperopia (farsightedness), the eyeball is too short or the
cornea too flat, causing the focal point to fall behind the retina.
3. Which of the following drops is a carbonic anhydrase inhibitor used to treat glaucoma?
A. Timolol
B. Dorzolamide
C. Brimonidine
D. Latanoprost
Answer: B
Conceptual Explanation: Dorzolamide is a topical carbonic anhydrase inhibitor that
reduces aqueous humor production.
4. What is the primary function of the ciliary body?
A. Light perception
B. Draining tears into the nasolacrimal duct
C. Production of aqueous humor and accommodation
D. Protecting the macula from UV light
Answer: C
, Conceptual Explanation: The ciliary body produces aqueous humor and contains the
ciliary muscle which controls the shape of the lens for accommodation.
5. The visual condition known as ‘presbyopia’ is primarily caused by:
A. Elongation of the eyeball
B. Loss of elasticity in the crystalline lens
C. Clouding of the crystalline lens
D. Irregular curvature of the cornea
Answer: B
Conceptual Explanation: Presbyopia occurs with age as the lens becomes less flexible,
making it difficult to focus on near objects.
6. Which cranial nerve is responsible for the constriction of the pupil?
A. Cranial Nerve II
B. Cranial Nerve III
C. Cranial Nerve IV
D. Cranial Nerve VI
Answer: B
Conceptual Explanation: The Oculomotor nerve (CN III) carries parasympathetic fibers
that stimulate the sphincter pupillae muscle.
