Unit 7; Contact Lens Fitting Flashcards
1
Q
HVID
A
Horizontal visible iris diameter
-Average is 11.8 mm
2
Q
Characteristics of a good contact lens fit
A
-Corneal coverage extends 1 mm past limbus
-Lens centration
-Dynamic fit (.25 to .5 mm of movement with blink)
-Alignment (Doesn’t indent conjunctival vessels)
-Comfort
3
Q
Slit lamp evaluation of fit includes looking at
A
-Corneal coverage
-Centration
-Primary gaze post-blink movement
-Push-up test
-Lens edge evaluation
4
Q
Example of recording centration
A
Centred OU; slight nasal decentration
5
Q
Example of recording movement
A
+0.5mm OD; Moves easily with push-up and +1 mm movement in upgaze
6
Q
Example of recording periphery
A
Flat edges OU
7
Q
Example of recording corneal data
A
No corneal staining
8
Q
Example of recording visual acuity
A
OD VA 20/25 SOR -0.25 20/20
