Quiz 6 Flashcards
Given the following Rx -5.00 +1.50 x090 ignoring Vertex Distance, what would the spherical equivalent power be for a Spherical soft lens?
a. -4.25
b. -3.50
c. -5.00
d. -5.75
a. -4.25
Excessive movement of a soft lens can be corrected by:
a. A larger diameter
b. A flatter lens
c. Boiling the lens
d. A smaller diameter
a. A larger diameter
In choosing the diameter of a soft lens, what is the general rule of thumb?
a. 2.0mm larger than HVID (horizontal visible iris diameter)
b. 1.0mm larger than HVID
c. 3.0mm larger than HVID
d. 2.0mm smaller then HVID
a. 2.0mm larger than HVID
What material would be used for someone interested in Intermittent Wear?
a. CAB
b. HEMA
c. PMMA
d. FPA
b. HEMA
Insufficient movement of a soft lens can be corrected by:
a. A smaller diameter
b. A thinner lens
c. A larger diameter
d. A steeper lens
a. A smaller diameter
The “DK” value of a contact lens material indicates it’s:
a. Permeability
b. Dimensional Stability
c. Transmissibilty
d. Wettabilty
a. Permeability
A tight fitting soft contact lens has the following characteristics except:
a. Scleral Indentation
b. Edge Stand Off
c. Bubbles Under Center Of The Lens
d. No Free Movement On Upward Gaze
b. Edge Stand Off
A change in which of the following will most noticeably affect the lens-cornea relationship of a soft lens?
a. Diameter
b. Edge Shape
c. Anterior Lens Surface
d. Peripheral Curves
a. Diameter
When Keratometric mires reflected off a soft contact lens are only clear when the wearer blinks, the lens fit is too:
a. Steep
b. Flat
c. Small
d. Large
a. Steep
Which of the following should be considered when determining the lens material to be used?
- Part time vs Full time wear
- Work Conditions
- Slip Lamp Evaluation with Fluorescein
a. 1, 2 and 3
b. 2 and 3 only
c. 1 and 3 only
d. 1 only
a. 1, 2 and 3
