The tear film consists of which the following?
a. aqueous layer
b. conjunctiva
c. lipid film
d. mucin film Correct Answer: a c d
The primary function of the mucin film is to: change the corneal epithelial sur
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The tear film consists of which the following?
a. aqueous layer
b. conjunctiva
c. lipid film
d. mucin film Correct Answer: a c d
The primary function of the mucin film is to: change the corneal epithelial surface from a "_________ surface to a ___________ surface" Correct Answer: hydrophobic surface to a hydrophilic surface
The lipid layer functions primarily to: Correct Answer: prevent evaporation of the tear film
The test which assesses the quantity of tears normally produced is: __________ Correct Answer: Schimmer
The test which assesses the quality of the tear film is: _______ Correct Answer: BUT
Prospective patients who fall within the following age group generally provide the best prognosis for successful contact lens fitting: ________ to ________ Correct Answer: 13 to 38
Which of the following would indicate a good prognosis for successful contact lens fitting?
a. adequate manual dexterity
b. regular low astigmatism
c. refractive error less than ± 1.50 D.
d. BUTs longer than 15 seconds Correct Answer: a b d
The base curve of a certain contact lens is equal to 7.5 mm radius of curvature. The equivalent power in diopters is: __.__ Correct Answer: 45.00
The primary function of a keratometer is to: measure the "________ of the _________" Correct Answer: curvature of the cornea
When moved 5 mm from its original position the effective power of a 10.00 diopters lens will change: "_.__ D" Correct Answer: 0.50 D
When a spectacle lens prescription exceeds ___________ diopters, vertex distance must be compensated for when determining the power of a contact lens. Correct Answer: ±4.00 D
A spectacle lens is prescribed at -10.00 diopters provided that the lens is fit at a vertex distance of 10 mm. A rigid contact lens fit "on K" for this patient would require a power of: Correct Answer: -9.00 D
Spectacle Rx = +10.00 D
Vertex distance = 10 mm
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