Optometry Admission Test OAT PracticeUltimate
Exam
**Question 1.** Which layer of the eye contains the photoreceptor cells?
A) Sclera
B) Cornea
C) Retina
D) Choroid
Answer: C
Explanation: The retina is the innermost layer and houses rods and cones that detect light.
**Question 2.** The primary function of the lacrimal gland is to:
A) Produce mucus
B) Drain tears into the nasal cavity
C) Produce the aqueous component of tears
D) Lubricate the eyelid margin
Answer: C
Explanation: The lacrimal gland secretes the watery portion of the tear film essential for corneal health.
**Question 3.** Which extraocular muscle is responsible for adduction of the eye?
A) Lateral rectus
B) Superior oblique
C) Medial rectus
D) Inferior oblique
Answer: C
Explanation: The medial (or internal) rectus pulls the eye toward the nose, producing adduction.
, Optometry Admission Test OAT PracticeUltimate
Exam
**Question 4.** The optic nerve is classified as which cranial nerve?
A) III
B) V
C) VII
D) II
Answer: D
Explanation: The optic nerve (CN II) transmits visual information from the retina to the brain.
**Question 5.** Light entering a myopic eye is focused:
A) Directly on the retina
B) Behind the retina
C) In front of the retina
D) At the corneal apex
Answer: C
Explanation: In myopia, the eye is too long or the cornea too steep, causing the focal point to lie anterior
to the retina.
**Question 6.** Hyperopia occurs because the eye’s optical power is:
A) Too strong, focusing light in front of the retina
B) Too weak, focusing light behind the retina
C) Uneven, causing astigmatism
D) Variable, leading to presbyopia
Answer: B
, Optometry Admission Test OAT PracticeUltimate
Exam
Explanation: In hyperopia, the eye is too short or cornea too flat, so the focal point falls behind the
retina.
**Question 7.** Which refractive error is most commonly associated with aging?
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: D
Explanation: Presbyopia results from loss of lens elasticity with age, reducing accommodation.
**Question 8.** A cylindrical lens corrects which type of refractive error?
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: C
Explanation: Cylindrical power compensates for the irregular curvature causing astigmatism.
**Question 9.** In transposition of a prescription, the axis of the cylinder is:
A) Added 90°
B) Subtracted 90°
C) Remains unchanged
D) Multiplied by 2
, Optometry Admission Test OAT PracticeUltimate
Exam
Answer: B
Explanation: Converting plus to minus cylinder (or vice versa) requires subtracting the axis from 180°; if
the result is <0°, add 180°.
**Question 10.** The vertex distance most affects the effective power of:
A) Contact lenses
B) Spectacle lenses
C) Intraocular lenses
D) None of the above
Answer: B
Explanation: Vertex distance (distance from lens to cornea) changes the effective power of spectacles,
especially high prescriptions.
**Question 11.** The Snellen chart is primarily used to assess:
A) Color vision
B) Visual acuity
C) Intraocular pressure
D) Depth perception
Answer: B
Explanation: The Snellen chart measures the smallest line of letters a patient can read at a standardized
distance.
**Question 12.** The “PERRLA” acronym stands for:
A) Pupils Equal, Reactive to Red Light and Accommodation
B) Pupils Equal, Reactive to Light and Accommodation
Exam
**Question 1.** Which layer of the eye contains the photoreceptor cells?
A) Sclera
B) Cornea
C) Retina
D) Choroid
Answer: C
Explanation: The retina is the innermost layer and houses rods and cones that detect light.
**Question 2.** The primary function of the lacrimal gland is to:
A) Produce mucus
B) Drain tears into the nasal cavity
C) Produce the aqueous component of tears
D) Lubricate the eyelid margin
Answer: C
Explanation: The lacrimal gland secretes the watery portion of the tear film essential for corneal health.
**Question 3.** Which extraocular muscle is responsible for adduction of the eye?
A) Lateral rectus
B) Superior oblique
C) Medial rectus
D) Inferior oblique
Answer: C
Explanation: The medial (or internal) rectus pulls the eye toward the nose, producing adduction.
, Optometry Admission Test OAT PracticeUltimate
Exam
**Question 4.** The optic nerve is classified as which cranial nerve?
A) III
B) V
C) VII
D) II
Answer: D
Explanation: The optic nerve (CN II) transmits visual information from the retina to the brain.
**Question 5.** Light entering a myopic eye is focused:
A) Directly on the retina
B) Behind the retina
C) In front of the retina
D) At the corneal apex
Answer: C
Explanation: In myopia, the eye is too long or the cornea too steep, causing the focal point to lie anterior
to the retina.
**Question 6.** Hyperopia occurs because the eye’s optical power is:
A) Too strong, focusing light in front of the retina
B) Too weak, focusing light behind the retina
C) Uneven, causing astigmatism
D) Variable, leading to presbyopia
Answer: B
, Optometry Admission Test OAT PracticeUltimate
Exam
Explanation: In hyperopia, the eye is too short or cornea too flat, so the focal point falls behind the
retina.
**Question 7.** Which refractive error is most commonly associated with aging?
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: D
Explanation: Presbyopia results from loss of lens elasticity with age, reducing accommodation.
**Question 8.** A cylindrical lens corrects which type of refractive error?
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: C
Explanation: Cylindrical power compensates for the irregular curvature causing astigmatism.
**Question 9.** In transposition of a prescription, the axis of the cylinder is:
A) Added 90°
B) Subtracted 90°
C) Remains unchanged
D) Multiplied by 2
, Optometry Admission Test OAT PracticeUltimate
Exam
Answer: B
Explanation: Converting plus to minus cylinder (or vice versa) requires subtracting the axis from 180°; if
the result is <0°, add 180°.
**Question 10.** The vertex distance most affects the effective power of:
A) Contact lenses
B) Spectacle lenses
C) Intraocular lenses
D) None of the above
Answer: B
Explanation: Vertex distance (distance from lens to cornea) changes the effective power of spectacles,
especially high prescriptions.
**Question 11.** The Snellen chart is primarily used to assess:
A) Color vision
B) Visual acuity
C) Intraocular pressure
D) Depth perception
Answer: B
Explanation: The Snellen chart measures the smallest line of letters a patient can read at a standardized
distance.
**Question 12.** The “PERRLA” acronym stands for:
A) Pupils Equal, Reactive to Red Light and Accommodation
B) Pupils Equal, Reactive to Light and Accommodation
