Which of the following medications may affect successful contact lens wear?
a. antacids
b. antihistamines
c. aspirin
d. laxatives - ✔✔antihistamines
Which term refers to a sensitivity to light
A.presbyopia
B.Photo
...
Which of the following medications may affect successful contact lens wear?
a. antacids
b. antihistamines
c. aspirin
d. laxatives - ✔✔antihistamines
Which term refers to a sensitivity to light
A.presbyopia
B.Photophobia
C.Pannus
D. Ptosis - ✔✔Photophobia
The following is an example of what type of astigmatism?
K's 42.50 @180 /40.50 @90
A. with the rule
B. Lenticular astigmatism
C.Against the rule
D. Irregular astigmatism - ✔✔Against the rule astigmatism
The cornea receives nutrients from
1 Aqueous humor
2 Tears
3 Limbal blood vessels
4 Orbicularis occulia. 1, 3 & 4
b. 2 & 3
c. 1, 2 & 3
d. 3 & 4 - ✔✔aqueous humor, tears and limbal blood vessels
The increased loss of ability of the crystalline lens to accommodate is called? - ✔✔presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctivitis,
lashes, contact lens surface and fit?
A. Radius scope
B. Corneascope
C. Slitlamp
D. Keratometer - ✔✔Slit lamp
The classic model of the pre-corneal tear film is composed of three layers what are they? -
✔✔Lipids aqueous mucin
The average ph value of the human tear is
a. 6.6
b. 7.4
c. 7.8
d. 10.0 - ✔✔B. 7.4
If the manufacturers guidelines suggest a minimum of four hours for this 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 four hours is required - ✔✔A minimum of four hours is requiredThe main supply of oxygen to the corneal epithelium is derived from the
A.Stroma
B.Collagen fibrils
C.Basal membrane
D.Tear film - ✔✔Tear film
What is the term for the condition in which there is loss of vision without any apparent disease to
the eye? - ✔✔amblyopia
Which auxiliary lens will extend the keratometer range to approximately 30.00D? - ✔✔-1.00
Which step should be performed first when taking keratometer measurements? - ✔✔Focus the
eyepiece
The following is an example of what type of astigmatism
K's 44.00 @180/ 44.50 @90
RX -3.00 -2.50 X 180 - ✔✔Lenticular astigmatism
Ocular signs of aging include
A. Tear film abnormalities
B.Reduced lid elasticity
C.Lens opacities
D.Loss of accommodation - ✔✔Tear film abnormalities
Reduced lid elasticity
Lens opacities
Loss of accommodationThe pre-corneal tear film provides: - ✔✔A smooth optical surface, metabolic nutrients to the
epithelium
What are the layers of the cornea? - ✔✔Epithelium, bowmans 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? - ✔✔endothelium
A normal tear break-up time is: - ✔✔10-12 seconds
A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the
elderly is known as? - ✔✔Arcus senilus
Patients with keratitis sicca are more prone to? - ✔✔Secondary infections
Upon removal of the crystalline lens the patient is? - ✔✔Aphakic
The following are RX represents
OD+2.00= 20/20
OS-3.00-2.00X180=20/20 -
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