Missouri Optometry Licensing Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which layer of the tear film is primarily responsible for preventing
evaporation?
A. Mucin layer
B. Aqueous layer
C. Lipid layer
D. Corneal epithelium
Answer: C. Lipid layer
Rationale: The lipid layer, produced by the meibomian glands, reduces tear
evaporation and stabilizes the tear film.
2. Which nerve provides sensory innervation to the cornea?
A. Optic nerve
B. Trigeminal nerve (V1)
, C. Facial nerve
D. Oculomotor nerve
Answer: B. Trigeminal nerve (V1)
Rationale: The ophthalmic branch of the trigeminal nerve supplies corneal
sensation.
3. The primary site of aqueous humor production is the:
A. Trabecular meshwork
B. Ciliary body
C. Schlemm’s canal
D. Iris
Answer: B. Ciliary body
Rationale: The non-pigmented epithelium of the ciliary body produces
aqueous humor.
4. Which refractive condition is associated with a shortened axial length?
A. Myopia
B. Hyperopia
C. Astigmatism
D. Presbyopia
Answer: B. Hyperopia
Rationale: Hyperopia occurs when the eye is too short or refractive power
is too weak.
, 5. The most common cause of reversible vision loss in children is:
A. Cataract
B. Glaucoma
C. Amblyopia
D. Retinitis pigmentosa
Answer: C. Amblyopia
Rationale: Amblyopia is reduced vision due to abnormal visual
development and is reversible if treated early.
6. Which drug class is most commonly used to reduce intraocular
pressure by decreasing aqueous production?
A. Beta-blockers
B. Antibiotics
C. Antihistamines
D. Cycloplegics
Answer: A. Beta-blockers
Rationale: Beta-blockers like timolol reduce aqueous humor production by
acting on the ciliary body.
7. The Snellen chart primarily measures:
A. Contrast sensitivity
B. Visual acuity
, C. Color vision
D. Depth perception
Answer: B. Visual acuity
Rationale: The Snellen chart evaluates distance visual acuity.
8. A patient with sudden painless vision loss and a “cherry-red spot”
likely has:
A. Retinal detachment
B. Central retinal artery occlusion
C. Glaucoma
D. Optic neuritis
Answer: B. Central retinal artery occlusion
Rationale: Ischemia of the inner retina causes a pale retina with a cherry-
red fovea.
9. Which vitamin deficiency is associated with night blindness?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Answer: A. Vitamin A
Rationale: Vitamin A is essential for rhodopsin formation in rods.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which layer of the tear film is primarily responsible for preventing
evaporation?
A. Mucin layer
B. Aqueous layer
C. Lipid layer
D. Corneal epithelium
Answer: C. Lipid layer
Rationale: The lipid layer, produced by the meibomian glands, reduces tear
evaporation and stabilizes the tear film.
2. Which nerve provides sensory innervation to the cornea?
A. Optic nerve
B. Trigeminal nerve (V1)
, C. Facial nerve
D. Oculomotor nerve
Answer: B. Trigeminal nerve (V1)
Rationale: The ophthalmic branch of the trigeminal nerve supplies corneal
sensation.
3. The primary site of aqueous humor production is the:
A. Trabecular meshwork
B. Ciliary body
C. Schlemm’s canal
D. Iris
Answer: B. Ciliary body
Rationale: The non-pigmented epithelium of the ciliary body produces
aqueous humor.
4. Which refractive condition is associated with a shortened axial length?
A. Myopia
B. Hyperopia
C. Astigmatism
D. Presbyopia
Answer: B. Hyperopia
Rationale: Hyperopia occurs when the eye is too short or refractive power
is too weak.
, 5. The most common cause of reversible vision loss in children is:
A. Cataract
B. Glaucoma
C. Amblyopia
D. Retinitis pigmentosa
Answer: C. Amblyopia
Rationale: Amblyopia is reduced vision due to abnormal visual
development and is reversible if treated early.
6. Which drug class is most commonly used to reduce intraocular
pressure by decreasing aqueous production?
A. Beta-blockers
B. Antibiotics
C. Antihistamines
D. Cycloplegics
Answer: A. Beta-blockers
Rationale: Beta-blockers like timolol reduce aqueous humor production by
acting on the ciliary body.
7. The Snellen chart primarily measures:
A. Contrast sensitivity
B. Visual acuity
, C. Color vision
D. Depth perception
Answer: B. Visual acuity
Rationale: The Snellen chart evaluates distance visual acuity.
8. A patient with sudden painless vision loss and a “cherry-red spot”
likely has:
A. Retinal detachment
B. Central retinal artery occlusion
C. Glaucoma
D. Optic neuritis
Answer: B. Central retinal artery occlusion
Rationale: Ischemia of the inner retina causes a pale retina with a cherry-
red fovea.
9. Which vitamin deficiency is associated with night blindness?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Answer: A. Vitamin A
Rationale: Vitamin A is essential for rhodopsin formation in rods.
