California Optometrist Licensing Exam
(NBEO) With Actual Questions &
Verified Answers ,Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
1. Which structure in the eye is primarily responsible for aqueous
humor production?
A) Cornea
B) Ciliary body
C) Lens
D) Retina
B) Ciliary body
The ciliary body contains the ciliary processes, which produce
aqueous humor that nourishes the eye and maintains intraocular
pressure.
2. What is the most common cause of bacterial conjunctivitis in
adults?
A) Staphylococcus aureus
B) Haemophilus influenzae
C) Streptococcus pneumoniae
D) Pseudomonas aeruginosa
,A) Staphylococcus aureus
In adults, Staphylococcus aureus is the most common bacterial
pathogen causing conjunctivitis, whereas H. influenzae is more
common in children.
3. A patient presents with sudden monocular vision loss and a
cherry-red spot on the macula. The most likely diagnosis is:
A) Central retinal artery occlusion
B) Central retinal vein occlusion
C) Diabetic retinopathy
D) Retinal detachment
A) Central retinal artery occlusion
CRAO presents with sudden, painless monocular vision loss. The
cherry-red spot occurs because the fovea is thin and shows
underlying choroid while the surrounding retina becomes pale due
to ischemia.
4. Which of the following is the hallmark feature of
keratoconjunctivitis sicca?
A) Redness
B) Painful ulcers
C) Dryness and foreign body sensation
D) Photophobia
C) Dryness and foreign body sensation
Keratoconjunctivitis sicca, or dry eye syndrome, is characterized by
insufficient tear production or poor tear quality, leading to ocular
dryness and irritation.
5. Which refractive error is caused by an elongated axial length of
the eye?
A) Myopia
B) Hyperopia
, C) Presbyopia
D) Astigmatism
A) Myopia
Axial myopia occurs when the eye is too long relative to its optical
power, causing light to focus in front of the retina.
6. What is the first-line treatment for open-angle glaucoma?
A) Oral acetazolamide
B) Prostaglandin analogs
C) Laser trabeculoplasty
D) Trabeculectomy
B) Prostaglandin analogs
Prostaglandin analogs (e.g., latanoprost) are first-line therapy for
lowering intraocular pressure in open-angle glaucoma due to their
efficacy and once-daily dosing.
7. Which cranial nerve is responsible for pupillary constriction in
response to light?
A) CN II
B) CN III
C) CN IV
D) CN VI
B) CN III
The oculomotor nerve (CN III) carries parasympathetic fibers to the
sphincter pupillae, mediating pupillary constriction (direct and
consensual light reflex).
8. A patient has diplopia that worsens when looking down and
medially. Which cranial nerve is likely affected?
A) CN III
B) CN IV
, C) CN VI
D) CN VII
B) CN IV
The trochlear nerve (CN IV) innervates the superior oblique muscle.
Dysfunction causes vertical diplopia, especially when looking down
and in.
9. Which condition is characterized by optic disc cupping and
progressive peripheral visual field loss?
A) Cataract
B) Macular degeneration
C) Glaucoma
D) Diabetic retinopathy
C) Glaucoma
Open-angle glaucoma leads to progressive optic neuropathy with
characteristic cupping and peripheral visual field loss.
10. In fluorescein staining, which corneal layer is primarily
visualized?
A) Epithelium
B) Stroma
C) Endothelium
D) Descemet's membrane
A) Epithelium
Fluorescein dye highlights defects in the corneal epithelium,
allowing detection of abrasions, ulcers, or erosions.
11. What is the most common type of cataract in aging
adults?
A) Nuclear sclerotic
B) Cortical
(NBEO) With Actual Questions &
Verified Answers ,Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
1. Which structure in the eye is primarily responsible for aqueous
humor production?
A) Cornea
B) Ciliary body
C) Lens
D) Retina
B) Ciliary body
The ciliary body contains the ciliary processes, which produce
aqueous humor that nourishes the eye and maintains intraocular
pressure.
2. What is the most common cause of bacterial conjunctivitis in
adults?
A) Staphylococcus aureus
B) Haemophilus influenzae
C) Streptococcus pneumoniae
D) Pseudomonas aeruginosa
,A) Staphylococcus aureus
In adults, Staphylococcus aureus is the most common bacterial
pathogen causing conjunctivitis, whereas H. influenzae is more
common in children.
3. A patient presents with sudden monocular vision loss and a
cherry-red spot on the macula. The most likely diagnosis is:
A) Central retinal artery occlusion
B) Central retinal vein occlusion
C) Diabetic retinopathy
D) Retinal detachment
A) Central retinal artery occlusion
CRAO presents with sudden, painless monocular vision loss. The
cherry-red spot occurs because the fovea is thin and shows
underlying choroid while the surrounding retina becomes pale due
to ischemia.
4. Which of the following is the hallmark feature of
keratoconjunctivitis sicca?
A) Redness
B) Painful ulcers
C) Dryness and foreign body sensation
D) Photophobia
C) Dryness and foreign body sensation
Keratoconjunctivitis sicca, or dry eye syndrome, is characterized by
insufficient tear production or poor tear quality, leading to ocular
dryness and irritation.
5. Which refractive error is caused by an elongated axial length of
the eye?
A) Myopia
B) Hyperopia
, C) Presbyopia
D) Astigmatism
A) Myopia
Axial myopia occurs when the eye is too long relative to its optical
power, causing light to focus in front of the retina.
6. What is the first-line treatment for open-angle glaucoma?
A) Oral acetazolamide
B) Prostaglandin analogs
C) Laser trabeculoplasty
D) Trabeculectomy
B) Prostaglandin analogs
Prostaglandin analogs (e.g., latanoprost) are first-line therapy for
lowering intraocular pressure in open-angle glaucoma due to their
efficacy and once-daily dosing.
7. Which cranial nerve is responsible for pupillary constriction in
response to light?
A) CN II
B) CN III
C) CN IV
D) CN VI
B) CN III
The oculomotor nerve (CN III) carries parasympathetic fibers to the
sphincter pupillae, mediating pupillary constriction (direct and
consensual light reflex).
8. A patient has diplopia that worsens when looking down and
medially. Which cranial nerve is likely affected?
A) CN III
B) CN IV
, C) CN VI
D) CN VII
B) CN IV
The trochlear nerve (CN IV) innervates the superior oblique muscle.
Dysfunction causes vertical diplopia, especially when looking down
and in.
9. Which condition is characterized by optic disc cupping and
progressive peripheral visual field loss?
A) Cataract
B) Macular degeneration
C) Glaucoma
D) Diabetic retinopathy
C) Glaucoma
Open-angle glaucoma leads to progressive optic neuropathy with
characteristic cupping and peripheral visual field loss.
10. In fluorescein staining, which corneal layer is primarily
visualized?
A) Epithelium
B) Stroma
C) Endothelium
D) Descemet's membrane
A) Epithelium
Fluorescein dye highlights defects in the corneal epithelium,
allowing detection of abrasions, ulcers, or erosions.
11. What is the most common type of cataract in aging
adults?
A) Nuclear sclerotic
B) Cortical
