LV Flashcards
1
Q
Maximum scotopic wavelength
A
Night vision. Rods. 507
2
Q
Maximum wavelength photopic vision
A
Cones. Bright light. 555
3
Q
Mesopic vision
A
Both. Watching tv in dark room
4
Q
Stiles Crawford effect
A
Light that hits the eye perpendicular will appear brighter than if hit at an angle
5
Q
Troxler effect
A
Images that are stationary on retina will fade
6
Q
To convert ETDRS card to snellen
A
At 4M x by 20
At 2M x by 10
At 1M x by 1
I.e.: if patient reads 2M x 10 = 20/200
7
Q
Keplerian telescope
A
F ocular/ F objective
Keplerian is positive objective and positive ocular
Galilean is negative ocular and positive objective
