ABO-NCLE Certification Examination
Question Bank Advanced Opticianry and
Contact Lens Registry Multiple-Choice
Questions with Detailed Answer Rationales
for Professional Certification Candidates
1. (Questions 1–10)
2. (Questions 11–20)
3. (Questions 21–40)
4. (Questions 41–55)
5. (Questions 56–75)
6. (Questions 76–95)
7. (Questions 96–105)
8. (Questions 106–115)
9. (Questions 116–130)
10. (Questions 131–140)
11. (Questions 141–150)
,A. Corneal epithelium
B. Bowman's membrane
C. Corneal endothelium
D. Descemet's membrane
The corneal endothelium is a monolayer of cells responsible for maintaining corneal
transparency through active fluid transport (Na⁺/K⁺-ATPase pump), keeping the stroma in a relative
state of dehydration. Endothelial cell dysfunction or loss leads to corneal edema, which manifests
clinically as halos and reduced contrast sensitivity. The epithelium provides a barrier function, Bowman's
membrane is an acellular condensation of the anterior stroma, and Descemet's membrane is the
basement membrane of the endothelium. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
A. Increase the fluorescein concentration
B. Decrease the slit lamp illumination
C. Increase the applanation pressure
D. Reduce the tear film thickness
In Goldmann applanation tonometry, the mires should be aligned so that the inner edges
just touch (forming a horizontal "dumbbell" appearance). Wide, separated mires indicate that
insufficient pressure is being applied to the cornea. The optician should increase the applanation
pressure until the inner edges of the mires meet. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
A. Timolol maleate
B. Pilocarpine hydrochloride
C. Atropine sulfate
D. Tropicamide
, Pilocarpine is a direct-acting cholinergic agonist (parasympathomimetic) that stimulates
the ciliary muscle and pupillary sphincter, increasing aqueous humor outflow through the trabecular
meshwork. Timolol is a beta-blocker, atropine is an anticholinergic (cycloplegic), and tropicamide is a
short-acting mydriatic/cycloplegic. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.2)
A. Cataract formation
B. Diabetic retinopathy with retinal ischemia
C. Acute angle-closure glaucoma
D. Optic neuritis
Rubeosis iridis is the growth of new blood vessels on the iris surface, most commonly
secondary to retinal ischemia from proliferative diabetic retinopathy. The ischemic retina releases
vascular endothelial growth factor (VEGF), which diffuses anteriorly and stimulates neovascularization in
the anterior segment. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.2)
A. Epithelium, Descemet's membrane, Bowman's membrane, stroma, endothelium
B. Epithelium, Bowman's membrane, stroma, Descemet's membrane, endothelium
C. Endothelium, Descemet's membrane, stroma, Bowman's membrane, epithelium
D. Bowman's membrane, epithelium, stroma, endothelium, Descemet's membrane
The cornea consists of five layers from anterior to posterior: epithelium, Bowman's
membrane (anterior limiting lamina), stroma (substantia propria), Descemet's membrane (posterior
limiting lamina), and endothelium. This anatomical sequence is critical for understanding corneal
pathology and contact lens interactions. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
, A. Myopia
B. Hyperopia
C. Presbyopia
D. Astigmatism
Presbyopia is the age-related loss of accommodative amplitude due to lenticular sclerosis
and reduced elasticity of the crystalline lens. It typically becomes clinically significant between ages 40–
45 and manifests as difficulty with near tasks. Myopia, hyperopia, and astigmatism are refractive errors,
not accommodative disorders. (Source: ABO-NCLE Basic Exam Handbook, Domain 2.1)
A. Low-plus spectacle correction
B. High-plus spectacle correction
C. Low-minus spectacle correction
D. High-minus spectacle correction
Aphakia (absence of the crystalline lens) requires high-plus power correction, typically
ranging from +10.00 to +16.00 D, depending on the patient's original axial length. The crystalline lens
contributes approximately +20 D of power to the eye's total refractive system. (Source: ABO-NCLE Basic
Exam Handbook, Domain 2.1)
A. Strabismus
B. Amblyopia
C. Nystagmus
D. Diplopia
Nystagmus is defined as rhythmic, involuntary oscillatory movements of the eyes. It may
be congenital or acquired and can be horizontal, vertical, or rotary. Strabismus refers to misalignment of
Question Bank Advanced Opticianry and
Contact Lens Registry Multiple-Choice
Questions with Detailed Answer Rationales
for Professional Certification Candidates
1. (Questions 1–10)
2. (Questions 11–20)
3. (Questions 21–40)
4. (Questions 41–55)
5. (Questions 56–75)
6. (Questions 76–95)
7. (Questions 96–105)
8. (Questions 106–115)
9. (Questions 116–130)
10. (Questions 131–140)
11. (Questions 141–150)
,A. Corneal epithelium
B. Bowman's membrane
C. Corneal endothelium
D. Descemet's membrane
The corneal endothelium is a monolayer of cells responsible for maintaining corneal
transparency through active fluid transport (Na⁺/K⁺-ATPase pump), keeping the stroma in a relative
state of dehydration. Endothelial cell dysfunction or loss leads to corneal edema, which manifests
clinically as halos and reduced contrast sensitivity. The epithelium provides a barrier function, Bowman's
membrane is an acellular condensation of the anterior stroma, and Descemet's membrane is the
basement membrane of the endothelium. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
A. Increase the fluorescein concentration
B. Decrease the slit lamp illumination
C. Increase the applanation pressure
D. Reduce the tear film thickness
In Goldmann applanation tonometry, the mires should be aligned so that the inner edges
just touch (forming a horizontal "dumbbell" appearance). Wide, separated mires indicate that
insufficient pressure is being applied to the cornea. The optician should increase the applanation
pressure until the inner edges of the mires meet. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
A. Timolol maleate
B. Pilocarpine hydrochloride
C. Atropine sulfate
D. Tropicamide
, Pilocarpine is a direct-acting cholinergic agonist (parasympathomimetic) that stimulates
the ciliary muscle and pupillary sphincter, increasing aqueous humor outflow through the trabecular
meshwork. Timolol is a beta-blocker, atropine is an anticholinergic (cycloplegic), and tropicamide is a
short-acting mydriatic/cycloplegic. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.2)
A. Cataract formation
B. Diabetic retinopathy with retinal ischemia
C. Acute angle-closure glaucoma
D. Optic neuritis
Rubeosis iridis is the growth of new blood vessels on the iris surface, most commonly
secondary to retinal ischemia from proliferative diabetic retinopathy. The ischemic retina releases
vascular endothelial growth factor (VEGF), which diffuses anteriorly and stimulates neovascularization in
the anterior segment. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.2)
A. Epithelium, Descemet's membrane, Bowman's membrane, stroma, endothelium
B. Epithelium, Bowman's membrane, stroma, Descemet's membrane, endothelium
C. Endothelium, Descemet's membrane, stroma, Bowman's membrane, epithelium
D. Bowman's membrane, epithelium, stroma, endothelium, Descemet's membrane
The cornea consists of five layers from anterior to posterior: epithelium, Bowman's
membrane (anterior limiting lamina), stroma (substantia propria), Descemet's membrane (posterior
limiting lamina), and endothelium. This anatomical sequence is critical for understanding corneal
pathology and contact lens interactions. (Source: ABO-NCLE Basic Exam Handbook, Domain 1.1)
, A. Myopia
B. Hyperopia
C. Presbyopia
D. Astigmatism
Presbyopia is the age-related loss of accommodative amplitude due to lenticular sclerosis
and reduced elasticity of the crystalline lens. It typically becomes clinically significant between ages 40–
45 and manifests as difficulty with near tasks. Myopia, hyperopia, and astigmatism are refractive errors,
not accommodative disorders. (Source: ABO-NCLE Basic Exam Handbook, Domain 2.1)
A. Low-plus spectacle correction
B. High-plus spectacle correction
C. Low-minus spectacle correction
D. High-minus spectacle correction
Aphakia (absence of the crystalline lens) requires high-plus power correction, typically
ranging from +10.00 to +16.00 D, depending on the patient's original axial length. The crystalline lens
contributes approximately +20 D of power to the eye's total refractive system. (Source: ABO-NCLE Basic
Exam Handbook, Domain 2.1)
A. Strabismus
B. Amblyopia
C. Nystagmus
D. Diplopia
Nystagmus is defined as rhythmic, involuntary oscillatory movements of the eyes. It may
be congenital or acquired and can be horizontal, vertical, or rotary. Strabismus refers to misalignment of
