NCLE Prep Exam Part 1 of 4 | with COMPLETE SOLUTION
Which of the following medications may affect successful contact lens wear?
A. Antacids
B. Antihistamines
C. Aspirin
D. Laxatives Correct Answer: B. Antihistimines
Which term refers to a sensitivity to light?
A. Prebyopia
B. Photophobia
C. Pannus
D. Ptosis Correct Answer: B. Photophobia
The following is an example of what type of astigmatism?
K's 42.50 @ .50 @ 90
A. With the Rule Astigmatism
B. Lenticular Astigmatism
C. Against the Rule Astigmatism
D. Irregular Astigmatism Correct Answer: C. Against the Rule Astigmatism
This is present when the K readings are steeper i the horizontal meridian than the vertical
meridian
The cornea receives nutrients from:
1) Aqueous Humor 2) Tears
3) Limbal Blood Vessels 4) Orbicularis Occuli
A. 1, 3 & 4
B. 2 &3
C. 1, 2 & 3
D. 3 & 4 Correct Answer: C. 1, 2 & 3
The normal cornea is devoid of blood vessels. To provide metabolites, the cornea is nourished by
diffusion of nutrients and oxygen by the aqueous humor, tears, and vascular blood vessels in the
limbus.
(The orbicularis occuli is a muscle in the eyelid whose primary function is lid closure)
The increased loss of ability of the crystalline lens to accommodate is called:
A. Presbyopia
B. Myopia
C. Hyperopia
D. Aphakia Correct Answer: A. Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva,
lashes, contact lens surface and fit?
A. Radiuscope
, B. Corneoscope
C. Slit Lamp
D. Keratometer Correct Answer: C. Slit Lamp
The slit lamp (or biomicroscope) can provide simultaneous information about the cornea, lids,
conjunctiva, lashes, contact lens surface and fit.
The pre-corneal tear film is composed of three layers which are:
A. Lysozyme, oil, lacrimal
B. Sebaceous, mucoid, BAK
C. Lipid, aqueous, mucin
D. Water, mucoid, lysozyme Correct Answer: C. Lipid, aqueous, mucin
The pre-corneal tear film is composed of lipid, aqueous, and mucin layers. The lipid layer is
traditionally thought of as most anterior (front) while the mucin layer is most posterior (back)
Transpose the following Rx into minus cylinder form:
Rx -4.50 +1.25 x 94
A. -3.25 -1.25 x 4
B. -3.25 -1.25 x 94
C. -4.50 -1.25 x 4
D. -5.75 - 1.25 x 4 Correct Answer: A. -3.25 -1.25 x 4
The average pH value of the human tear is:
A. 6.6
B. 7.4
C. 7.8
D. 10.0 Correct Answer: B. 7.4
Values higher than 7.4 are considered relatively alkaline, whereas values lower than 7.4 are
considered relatively acidic
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you
suggest to the patient?
A. Never leave lenses in disinfectant overnight
B. 2 to 3 hours is probably enough
C. Use surfactant cleaner and preserved saline
D. A minimum of 4 hours is required Correct Answer: D. Minimum of 4 hours required
Patients should always be directed to follow the manufacturer's guidelines and not try to cut
corners by leaving lenses in any solution for less than the recommended time.
The main supply of oxygen to the corneal epithelium is derived from the:
A. Stroma
B. Collagen Fibrils
Which of the following medications may affect successful contact lens wear?
A. Antacids
B. Antihistamines
C. Aspirin
D. Laxatives Correct Answer: B. Antihistimines
Which term refers to a sensitivity to light?
A. Prebyopia
B. Photophobia
C. Pannus
D. Ptosis Correct Answer: B. Photophobia
The following is an example of what type of astigmatism?
K's 42.50 @ .50 @ 90
A. With the Rule Astigmatism
B. Lenticular Astigmatism
C. Against the Rule Astigmatism
D. Irregular Astigmatism Correct Answer: C. Against the Rule Astigmatism
This is present when the K readings are steeper i the horizontal meridian than the vertical
meridian
The cornea receives nutrients from:
1) Aqueous Humor 2) Tears
3) Limbal Blood Vessels 4) Orbicularis Occuli
A. 1, 3 & 4
B. 2 &3
C. 1, 2 & 3
D. 3 & 4 Correct Answer: C. 1, 2 & 3
The normal cornea is devoid of blood vessels. To provide metabolites, the cornea is nourished by
diffusion of nutrients and oxygen by the aqueous humor, tears, and vascular blood vessels in the
limbus.
(The orbicularis occuli is a muscle in the eyelid whose primary function is lid closure)
The increased loss of ability of the crystalline lens to accommodate is called:
A. Presbyopia
B. Myopia
C. Hyperopia
D. Aphakia Correct Answer: A. Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva,
lashes, contact lens surface and fit?
A. Radiuscope
, B. Corneoscope
C. Slit Lamp
D. Keratometer Correct Answer: C. Slit Lamp
The slit lamp (or biomicroscope) can provide simultaneous information about the cornea, lids,
conjunctiva, lashes, contact lens surface and fit.
The pre-corneal tear film is composed of three layers which are:
A. Lysozyme, oil, lacrimal
B. Sebaceous, mucoid, BAK
C. Lipid, aqueous, mucin
D. Water, mucoid, lysozyme Correct Answer: C. Lipid, aqueous, mucin
The pre-corneal tear film is composed of lipid, aqueous, and mucin layers. The lipid layer is
traditionally thought of as most anterior (front) while the mucin layer is most posterior (back)
Transpose the following Rx into minus cylinder form:
Rx -4.50 +1.25 x 94
A. -3.25 -1.25 x 4
B. -3.25 -1.25 x 94
C. -4.50 -1.25 x 4
D. -5.75 - 1.25 x 4 Correct Answer: A. -3.25 -1.25 x 4
The average pH value of the human tear is:
A. 6.6
B. 7.4
C. 7.8
D. 10.0 Correct Answer: B. 7.4
Values higher than 7.4 are considered relatively alkaline, whereas values lower than 7.4 are
considered relatively acidic
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you
suggest to the patient?
A. Never leave lenses in disinfectant overnight
B. 2 to 3 hours is probably enough
C. Use surfactant cleaner and preserved saline
D. A minimum of 4 hours is required Correct Answer: D. Minimum of 4 hours required
Patients should always be directed to follow the manufacturer's guidelines and not try to cut
corners by leaving lenses in any solution for less than the recommended time.
The main supply of oxygen to the corneal epithelium is derived from the:
A. Stroma
B. Collagen Fibrils
