Unit 6

Question 0

A tight fitting soft contact lens has the following characteristics:
Minimal or no movement
Slight movement with glide or push up test.
Keratometer mires blurry but clear with blinking.
Good until comfort
Circumcorneal injection and indention

Question 1

Insufficient movement of a soft lens can be corrected by…

Answer 1

A smaller diameter.

Question 2

Characteristics of a good fit:
Good centration/full corneal coverage. 
0.5-1.0mm movement
Easy movement with glide or push up test
Stable keratometer mires
Good comfort

Question 3

Characteristics of loose lens are…
Poor centration, excessive movements,
Excessive movement with glide or push up test.
Keratometer mires blurry but clear after blinking.
Poor comfort
Edge stand-off

Question 4

A change in _______ will most noticeably affect the lens-cornea relationship of a soft lens?

Answer 4

Diameter

Question 5

The DK value of a contact lens material indicates it’s _____

Answer 5

Permeability

Question 6

When keratometer mires reflected off a soft contact lens are only clear when the wearer blinks, the lens fit is too ______.

Answer 6

Steep

Question 7

Excessive movement can be corrected by using a _______ diameter

Answer 7

Larger.

Question 8

What material would be used for someone interested in intermittent wear?

Answer 8

HEMA

Question 9

In choosing the diameter of a soft lens, what is the general rule of thumb?

Answer 9

2.0mm Larger than the HVID