COT CONTACT LENS REVIEW EXAM
QUESTIONS AND ANSWERS. VERIFIED
2026.
Which of the following medications may affect successful contact lens wear? -
ANS Antihistamines
Which term refers to sensitivity to light - ANS Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - ANS Against-The-Rule Astigmatism
The Cornea receives nutrients from - ANS Aqueous humor, Tears, Limbal blood vessels
The increased loss of ability of the crystalline lens to accommodate is called - ANS Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva,
lashes, contact lens surface and fit? - ANS Slit lamp
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,The classic model of the pre-corneal tear film is composed of three layers. They are: -
ANS lipid, aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - ANS -3.25 -1.25 X 4
The average pH value of the human tear is - ANS 7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you
suggest to the patient? - ANS A minimum of 4 hours is required
The main supply of oxygen to the corneal epithelium is derived from the - ANS Tear film
What is the term for the condition in which there is a loss of vision without any apparent
disease to the eye? - ANS Amblyopia
Which auxiliary trial lens will extend the keratometer range to approximately 30.00 D? - ANS -
1.00D
Which step should be performed first when taking keratometer measurements - ANS Focus
the eyepeice
The following is an example of what type of astigmatism
K's 44.00@ .50 @ 90
Rx -3.00-2.50 x 180 - ANS lenticular astigmatism
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Ocular signs of aging include: - ANS Tear film Abnormalities, Reduced lid elasticity, lens
opacities, loss of accommodation
Transpose the following Rx into minus cylinder form:
+1.50+1.00 x 75 - ANS +2.50-1.00 x 165
The pre-corneal tear film provides: - ANS A smooth optical surface, Metabolic nutrients to
the epithelium
The cornea has five distinct layers. In order from anterior to posterior they are: -
ANS Epithelium, Bowman's layer, Stroma, Descemet's membrane, Endothelium
The normal cornea is transparent due to the pump action creating proper fluid balance. Which
layer of the cornea is most responsible for maintaining this function? - ANS Endothelium
A normal tear break-up time is: - ANS 10-12 seconds
A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the
elderly is know as: - ANS Arcus Senilus
Patients with keratitis sicca are more prone to? - ANS Secondary infections
Upon removal of the crystalline lens, the patient is - ANS Aphakic
The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - ANS Anisometropia
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS. VERIFIED
2026.
Which of the following medications may affect successful contact lens wear? -
ANS Antihistamines
Which term refers to sensitivity to light - ANS Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - ANS Against-The-Rule Astigmatism
The Cornea receives nutrients from - ANS Aqueous humor, Tears, Limbal blood vessels
The increased loss of ability of the crystalline lens to accommodate is called - ANS Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva,
lashes, contact lens surface and fit? - ANS Slit lamp
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,The classic model of the pre-corneal tear film is composed of three layers. They are: -
ANS lipid, aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - ANS -3.25 -1.25 X 4
The average pH value of the human tear is - ANS 7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you
suggest to the patient? - ANS A minimum of 4 hours is required
The main supply of oxygen to the corneal epithelium is derived from the - ANS Tear film
What is the term for the condition in which there is a loss of vision without any apparent
disease to the eye? - ANS Amblyopia
Which auxiliary trial lens will extend the keratometer range to approximately 30.00 D? - ANS -
1.00D
Which step should be performed first when taking keratometer measurements - ANS Focus
the eyepeice
The following is an example of what type of astigmatism
K's 44.00@ .50 @ 90
Rx -3.00-2.50 x 180 - ANS lenticular astigmatism
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Ocular signs of aging include: - ANS Tear film Abnormalities, Reduced lid elasticity, lens
opacities, loss of accommodation
Transpose the following Rx into minus cylinder form:
+1.50+1.00 x 75 - ANS +2.50-1.00 x 165
The pre-corneal tear film provides: - ANS A smooth optical surface, Metabolic nutrients to
the epithelium
The cornea has five distinct layers. In order from anterior to posterior they are: -
ANS Epithelium, Bowman's layer, Stroma, Descemet's membrane, Endothelium
The normal cornea is transparent due to the pump action creating proper fluid balance. Which
layer of the cornea is most responsible for maintaining this function? - ANS Endothelium
A normal tear break-up time is: - ANS 10-12 seconds
A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the
elderly is know as: - ANS Arcus Senilus
Patients with keratitis sicca are more prone to? - ANS Secondary infections
Upon removal of the crystalline lens, the patient is - ANS Aphakic
The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - ANS Anisometropia
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
