Quiz 5 Flashcards

1
Q

With a Rigid Contact lens in place, a fluorescein pattern shows a narrow band horizontally with a concentration of fluorescein inferiorly and superiorly under the lens. Which of the following types of Astigmatism is represented by this pattern?

a. Residual
b. Lenticular
c. Against the Rule
d. With The Rule

A

d. With The Rule

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2
Q

“K” Readings 43.00/44.25 @090
Rx -4.00 +1.25 x090

Using the data from, the correct design of the CPC (base curve) and power of a contact lens fitted 0.25 flatter than “K” would be:

a. 44.00 -2.50
b. 42.75 -2.50
c. 43.25 -3.75
d. 44.00 -3.75

A

b. 42.75 -2.50

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3
Q

When observing a fluorescein pattern, an oval touch in the vertical meridian would indicate:

a. A steep fit and against the rule astigmatism
b. A flat and with the rule astigmatism
c. A steep fit and with the rule astigmatism
d. A flat fit and against the rule astigmatism

A

a. Steep fit and against the rule astigmatism*

* Not sure

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4
Q

_____ is used to thin the edge of a high minus contact lens.

a. Truncation
b. Prism Ballast
c. Myoflange
d. Hyperflange

A

d. Hyperflange

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5
Q

If a patient’s Rx is -2.50 +0.25 x090 and the lens is to be fitted 0.75 diopters steeper than the flattest meridian of the cornea, the power of the contact lens should be:

a. -3.00
b. -3.25
c. -2.00
d. -2.75

A

a. -3.00

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6
Q

A Hyperflange lens design is most frequently used for which of the following?

a. A high minus
b. A low plus
c. A low minus
d. A high plus

A

a. A high minus

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7
Q

“K” Readings 43.00 / 44.25 @090
Rx -4.00 +1.25 x090

Using the data above, the correct design of the central posterior curve (Base Curve) and power of a contact lens fitted on “K” would be:

a. 44.25 -4.00
b. 44.25 -2.75
c. 43.00 -2.75
d. 43.00 -4.00

A

c. 43.00 -2.75

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8
Q

Which of the following Lid positions is preferred when fitting RGP lenses?

a. U = -2 / L = 0
b. U = +2 / L = 0
c. U = 0 / L = +2
d. U = +2 / L = -2

A

b. U = +2 / L = 0

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9
Q

When fitting contact lenses, it is important to consider Vertex Distance when the Rx is greater than Plus or Minus:

a. 7.00D
b. 4.00D
c. 2.00D
d. 3.00D

A

b. 4.00D

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10
Q

Sagittal value describes:

a. The correct prescription
b. Nothing related to contact lenses
c. The vaulting effect of a lens
d. A condition to be avoided in fitting contact lenses

A

c. The vaulting effect of a lens

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