California Optometrist Licensing Exam Test
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of retinoscopy in an eye exam?
To objectively determine the refractive error of the eye
Retinoscopy helps assess how light reflects from the retina, allowing the
examiner to estimate refractive error objectively, especially useful in non-
verbal patients or to verify subjective refraction.
2. Which cranial nerve controls the lateral rectus muscle?
Cranial Nerve VI (Abducens nerve)
The abducens nerve innervates the lateral rectus muscle, responsible for
abducting the eye laterally.
3. What is the normal intraocular pressure (IOP) range in mmHg?
10 to 21 mmHg
Normal IOP typically ranges from 10 to 21 mmHg; pressures above this may
indicate glaucoma risk.
4. What condition is indicated by a sudden loss of vision and a “curtain”
descending over the visual field?
Retinal detachment
, A retinal detachment causes sudden vision loss with symptoms like a curtain
descending, due to separation of the retina from underlying tissue.
5. Which test is most commonly used to evaluate color vision defects?
Ishihara plates
Ishihara plates are standard for detecting red-green color deficiencies and
are widely used in clinical practice.
6. What does a positive Seidel test indicate?
Leakage of aqueous humor from the anterior chamber
A positive Seidel test shows fluorescein dye dilution, indicating a leak in the
cornea or sclera allowing aqueous humor to escape.
7. What is the first line treatment for bacterial conjunctivitis?
Topical broad-spectrum antibiotics
Bacterial conjunctivitis is treated effectively with topical antibiotics such as
erythromycin or fluoroquinolones.
8. Which lens type corrects myopia?
Concave (minus) lenses
Concave lenses diverge light rays to move the focal point back onto the
retina, correcting nearsightedness.
9. What is the significance of a RAPD (Relative Afferent Pupillary Defect)?
Indicates optic nerve or severe retinal disease on the affected side
RAPD reveals asymmetric optic nerve function, often from optic neuropathy
or severe retinal damage.
10.What condition is characterized by increased IOP with an open anterior
chamber angle?
, Primary open-angle glaucoma
This form of glaucoma shows increased IOP but a normal, open angle on
gonioscopy, causing gradual vision loss.
11.Which medication class is used to lower IOP by increasing aqueous
outflow?
Prostaglandin analogs
Prostaglandins increase uveoscleral outflow and are commonly prescribed
as first-line glaucoma therapy.
12.What is the typical cause of papilledema?
Increased intracranial pressure
Papilledema is optic disc swelling caused by raised intracranial pressure and
requires urgent evaluation.
13.Which part of the eye is affected in keratoconus?
Cornea
Keratoconus is a progressive thinning and conical deformation of the
cornea, affecting vision quality.
14.What does an Amsler grid test assess?
Central visual field and macular function
The Amsler grid detects central scotomas or metamorphopsia related to
macular diseases like AMD.
15.Which diagnostic tool measures corneal thickness?
Pachymetry
Pachymetry uses ultrasound or optical devices to measure corneal
thickness, important in glaucoma assessment and refractive surgery.
, 16.What is the most common cause of viral conjunctivitis?
Adenovirus
Adenovirus causes highly contagious viral conjunctivitis, often with follicular
reaction and preauricular lymphadenopathy.
17.What is the hallmark sign of a cataract?
Progressive, painless loss of vision with lens opacity
Cataracts cause opacification of the lens leading to gradual visual decline
without pain.
18.Which condition results from the occlusion of the central retinal artery?
Central retinal artery occlusion (CRAO)
CRAO causes sudden, painless vision loss and a characteristic cherry-red
spot on the retina.
19.Which medication is contraindicated in patients with narrow angles?
Anticholinergics
Anticholinergics dilate the pupil, potentially triggering angle closure in
susceptible eyes.
20.What structure produces aqueous humor in the eye?
Ciliary body
The ciliary body’s epithelium secretes aqueous humor that nourishes the
anterior segment.
21.What visual field defect is characteristic of glaucoma?
Peripheral visual field loss
Glaucoma initially affects peripheral vision due to optic nerve damage
before central vision is impaired.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of retinoscopy in an eye exam?
To objectively determine the refractive error of the eye
Retinoscopy helps assess how light reflects from the retina, allowing the
examiner to estimate refractive error objectively, especially useful in non-
verbal patients or to verify subjective refraction.
2. Which cranial nerve controls the lateral rectus muscle?
Cranial Nerve VI (Abducens nerve)
The abducens nerve innervates the lateral rectus muscle, responsible for
abducting the eye laterally.
3. What is the normal intraocular pressure (IOP) range in mmHg?
10 to 21 mmHg
Normal IOP typically ranges from 10 to 21 mmHg; pressures above this may
indicate glaucoma risk.
4. What condition is indicated by a sudden loss of vision and a “curtain”
descending over the visual field?
Retinal detachment
, A retinal detachment causes sudden vision loss with symptoms like a curtain
descending, due to separation of the retina from underlying tissue.
5. Which test is most commonly used to evaluate color vision defects?
Ishihara plates
Ishihara plates are standard for detecting red-green color deficiencies and
are widely used in clinical practice.
6. What does a positive Seidel test indicate?
Leakage of aqueous humor from the anterior chamber
A positive Seidel test shows fluorescein dye dilution, indicating a leak in the
cornea or sclera allowing aqueous humor to escape.
7. What is the first line treatment for bacterial conjunctivitis?
Topical broad-spectrum antibiotics
Bacterial conjunctivitis is treated effectively with topical antibiotics such as
erythromycin or fluoroquinolones.
8. Which lens type corrects myopia?
Concave (minus) lenses
Concave lenses diverge light rays to move the focal point back onto the
retina, correcting nearsightedness.
9. What is the significance of a RAPD (Relative Afferent Pupillary Defect)?
Indicates optic nerve or severe retinal disease on the affected side
RAPD reveals asymmetric optic nerve function, often from optic neuropathy
or severe retinal damage.
10.What condition is characterized by increased IOP with an open anterior
chamber angle?
, Primary open-angle glaucoma
This form of glaucoma shows increased IOP but a normal, open angle on
gonioscopy, causing gradual vision loss.
11.Which medication class is used to lower IOP by increasing aqueous
outflow?
Prostaglandin analogs
Prostaglandins increase uveoscleral outflow and are commonly prescribed
as first-line glaucoma therapy.
12.What is the typical cause of papilledema?
Increased intracranial pressure
Papilledema is optic disc swelling caused by raised intracranial pressure and
requires urgent evaluation.
13.Which part of the eye is affected in keratoconus?
Cornea
Keratoconus is a progressive thinning and conical deformation of the
cornea, affecting vision quality.
14.What does an Amsler grid test assess?
Central visual field and macular function
The Amsler grid detects central scotomas or metamorphopsia related to
macular diseases like AMD.
15.Which diagnostic tool measures corneal thickness?
Pachymetry
Pachymetry uses ultrasound or optical devices to measure corneal
thickness, important in glaucoma assessment and refractive surgery.
, 16.What is the most common cause of viral conjunctivitis?
Adenovirus
Adenovirus causes highly contagious viral conjunctivitis, often with follicular
reaction and preauricular lymphadenopathy.
17.What is the hallmark sign of a cataract?
Progressive, painless loss of vision with lens opacity
Cataracts cause opacification of the lens leading to gradual visual decline
without pain.
18.Which condition results from the occlusion of the central retinal artery?
Central retinal artery occlusion (CRAO)
CRAO causes sudden, painless vision loss and a characteristic cherry-red
spot on the retina.
19.Which medication is contraindicated in patients with narrow angles?
Anticholinergics
Anticholinergics dilate the pupil, potentially triggering angle closure in
susceptible eyes.
20.What structure produces aqueous humor in the eye?
Ciliary body
The ciliary body’s epithelium secretes aqueous humor that nourishes the
anterior segment.
21.What visual field defect is characteristic of glaucoma?
Peripheral visual field loss
Glaucoma initially affects peripheral vision due to optic nerve damage
before central vision is impaired.
