California Optometrist Licensing Exam — Full
100-Question Practice Test (with Answers &
Rationales)
1. The primary refractive component of the eye is the:
A. Cornea
B. Lens
C. Vitreous
D. Retina
✅ Answer: A
Rationale: The cornea contributes about two-thirds of the eye’s total refractive power and is the
major structure in focusing light.
2. Which cranial nerve controls most extraocular muscles?
A. CN IV
B. CN VI
C. CN III
D. CN V
✅ Answer: C
Rationale: The oculomotor nerve (CN III) controls the majority of eye muscles, except for the
lateral rectus (CN VI) and superior oblique (CN IV).
3. An increase in intraocular pressure primarily affects which structure?
A. Retina
B. Lens
C. Optic nerve head
D. Cornea
✅ Answer: C
Rationale: Elevated intraocular pressure can damage the optic nerve head, leading to
glaucomatous optic neuropathy.
,4. The Snellen chart measures:
A. Near visual acuity
B. Distance visual acuity
C. Color vision
D. Contrast sensitivity
✅ Answer: B
Rationale: The Snellen chart is used to test distance visual acuity at 20 feet (6 meters).
5. The normal range for intraocular pressure is:
A. 5–10 mmHg
B. 10–21 mmHg
C. 22–30 mmHg
D. 31–40 mmHg
✅ Answer: B
Rationale: Average IOP is around 16 mmHg, with normal limits between 10–21 mmHg.
6. The main function of the macula lutea is:
A. Peripheral vision
B. Central high-acuity vision
C. Color perception in low light
D. Rod cell stimulation
✅ Answer: B
Rationale: The macula, especially the fovea, provides central sharp vision for reading and
recognizing detail.
7. Which test evaluates color vision?
A. Maddox rod
B. Ishihara plates
C. Retinoscopy
D. Cover test
✅ Answer: B
Rationale: Ishihara color plates detect red-green color deficiencies through pseudoisochromatic
designs.
, 8. A patient presents with a red, painful eye and photophobia. Slit-lamp exam
shows cells and flare in the anterior chamber. The most likely diagnosis is:
A. Conjunctivitis
B. Iritis (anterior uveitis)
C. Keratitis
D. Glaucoma
✅ Answer: B
Rationale: Anterior uveitis presents with photophobia, redness, and cells in the anterior chamber
(“flare”).
9. Which of the following medications lowers intraocular pressure by decreasing
aqueous humor production?
A. Latanoprost
B. Timolol
C. Pilocarpine
D. Acetazolamide
✅ Answer: B
Rationale: Timolol is a beta-blocker that reduces aqueous humor production from the ciliary
body.
10. A cataract is best described as:
A. Elevated intraocular pressure
B. Opacification of the crystalline lens
C. Degeneration of the optic nerve
D. Retinal detachment
✅ Answer: B
Rationale: A cataract is a loss of lens transparency, causing blurred vision and glare.
11. The swinging flashlight test checks for:
A. Accommodation
B. Afferent pupillary defect (Marcus Gunn pupil)
C. Mydriasis
D. Astigmatism
✅ Answer: B
100-Question Practice Test (with Answers &
Rationales)
1. The primary refractive component of the eye is the:
A. Cornea
B. Lens
C. Vitreous
D. Retina
✅ Answer: A
Rationale: The cornea contributes about two-thirds of the eye’s total refractive power and is the
major structure in focusing light.
2. Which cranial nerve controls most extraocular muscles?
A. CN IV
B. CN VI
C. CN III
D. CN V
✅ Answer: C
Rationale: The oculomotor nerve (CN III) controls the majority of eye muscles, except for the
lateral rectus (CN VI) and superior oblique (CN IV).
3. An increase in intraocular pressure primarily affects which structure?
A. Retina
B. Lens
C. Optic nerve head
D. Cornea
✅ Answer: C
Rationale: Elevated intraocular pressure can damage the optic nerve head, leading to
glaucomatous optic neuropathy.
,4. The Snellen chart measures:
A. Near visual acuity
B. Distance visual acuity
C. Color vision
D. Contrast sensitivity
✅ Answer: B
Rationale: The Snellen chart is used to test distance visual acuity at 20 feet (6 meters).
5. The normal range for intraocular pressure is:
A. 5–10 mmHg
B. 10–21 mmHg
C. 22–30 mmHg
D. 31–40 mmHg
✅ Answer: B
Rationale: Average IOP is around 16 mmHg, with normal limits between 10–21 mmHg.
6. The main function of the macula lutea is:
A. Peripheral vision
B. Central high-acuity vision
C. Color perception in low light
D. Rod cell stimulation
✅ Answer: B
Rationale: The macula, especially the fovea, provides central sharp vision for reading and
recognizing detail.
7. Which test evaluates color vision?
A. Maddox rod
B. Ishihara plates
C. Retinoscopy
D. Cover test
✅ Answer: B
Rationale: Ishihara color plates detect red-green color deficiencies through pseudoisochromatic
designs.
, 8. A patient presents with a red, painful eye and photophobia. Slit-lamp exam
shows cells and flare in the anterior chamber. The most likely diagnosis is:
A. Conjunctivitis
B. Iritis (anterior uveitis)
C. Keratitis
D. Glaucoma
✅ Answer: B
Rationale: Anterior uveitis presents with photophobia, redness, and cells in the anterior chamber
(“flare”).
9. Which of the following medications lowers intraocular pressure by decreasing
aqueous humor production?
A. Latanoprost
B. Timolol
C. Pilocarpine
D. Acetazolamide
✅ Answer: B
Rationale: Timolol is a beta-blocker that reduces aqueous humor production from the ciliary
body.
10. A cataract is best described as:
A. Elevated intraocular pressure
B. Opacification of the crystalline lens
C. Degeneration of the optic nerve
D. Retinal detachment
✅ Answer: B
Rationale: A cataract is a loss of lens transparency, causing blurred vision and glare.
11. The swinging flashlight test checks for:
A. Accommodation
B. Afferent pupillary defect (Marcus Gunn pupil)
C. Mydriasis
D. Astigmatism
✅ Answer: B
