Optic Flashcards
1
Q
Verification of subjective results
A
- Pin hole
- Alteration of sphere & cylinder
- Transposition
- Jackson’s cross cylinder
- Astigmatism fan
- Maddox v
- Stenopic slit
- Duochrome rest
2
Q
Astigmatisms definition
A
It is a type of ametropia where pinpoint focus cannot be formed on the retina d/t unequal RE of the eye in different meridian
3
Q
What is Maddox
A
The device used in diagnosis of squint EOM imbalance
A series of powerful convex cylindrical lens mounted side by side in a trial lens
4
Q
Bifocal contraindications
A
- Age >50 yr
- Mentally subnormal
- Vertigo
- Uneducated
- Workers at high altitudes
- Reading add >40
- Anisometropia
- High oblique astigmatisms
- Aphakic glass
- Phoria uncompensated by Low prism
5
Q
Mechanism of Photogrey
A
Silver halide crystal in borosilicate
-> electromagnetic energy-> silver + halogen (darkening)
6
Q
Type of tinted
A
Absorptive
Reflective
Add by
- permeation
- coating
- solid tint
