Optics Flashcards
1
Q
Relation of hypermetropia to onset of presbyopia?
A
Hypermetropia hastens onset of presbyopia
2
Q
Principle of anti-reflective coating on glasses?
A
Destructive Interference
3
Q
Which light rays are absorbed by lens?
A
UV A (315-400nm)
UVB and UVC absorbed by cornea and sclera
4
Q
Principle of multifocal IOLs?
A
Diffraction, which is the interference of waves of light as they encounter an obstruction or opening, in order to create multi-focality.
5
Q
Image formed by Hruby lens?
A
Hruby lens-Plano concave lens of 58.6D produces a virtual, erect, diminished image anterior to retina within focal length of slit lamp
6
Q
Direction of distortion of cross during side to side movement of spherical lens?
A
Concave-with
Convex-against movement of cross
