Classification Of Astigmatism Flashcards
1
Q
Compound Hypermetropic Astigmatism
A
Both astigmatism foci lies posterior (behind) retina - both principal meridians are hypermetropic
2
Q
Simple Hypermetropic Astigmatism
A
Focus of the most powerful principal meridian lies on the retina with the focus of the other principal meridian posterior to the retina
- one meridian is emmetropic and the other is Hypermetropic
3
Q
Mixed Astigmatism
A
The astigmatic foci lie either side of the retina - one meridian is emmetropic and the other is Hypermetropic
4
Q
Simple Myopic Astigmatism
A
Focus of the least powerful principal meridian lies on the retina with the focus of the other principal meridian lying anterior (in front) of the retina
- one meridian is emmetropic and the other is myopic
