Final: Astigmatism Flashcards
1
Q
Cornea’s K value flatter than 42.00 generally indicates ________.
A
Hyperopia
2
Q
Cornea’s K value steeper than 44.00 generally indicates ______.
A
myopia
3
Q
Why is Javal’s rule needed?
A
It is needed because it takes into account of the induced cylinder that is from the crystalline lens
4
Q
If given two K readings, which K value determines the axis?
A
The smaller K value
5
Q
If the corneal cylinder is WTR or axis +/- 30 of 180, add ______ to axis 180.
A
+0.50D
6
Q
If the corneal cylinder is ATR or axis +/- 30 of 90, add ______ to axis 090.
A
- 0.50D
7
Q
How do you find refractive cylinder?
A
Corneal cylinder + Lenticular Cylinder( Javal’s Rule) = refractive cylinder
