Vision Flashcards
how many minutes of arc is an E
5 - so each part is 1
what is driving limit
20/50
what is legally blind
20/200
what are 5 other limits
- 10/200
- count finger
- hand motion
- light perception
- no light perception
what are vision documents
OD - right eye OS - left OU - both CC - corrected SC - uncorrected
what is divergence
light rays from a near object spread out
what does a concave lens do
increase divergence
what does a plus lens do
cause light rays to converge
what type of light requires more accomodation power
near light
what is presbyopia
near objects out of focus - insufficient accomodation
what is mypoia
near sighted - eye too long so get too much convergence
what is correction for myopia
give glasses to diverge light
what is hyperopia
light converges behind eye - need more accomodation as age
what is astigmatism
weird shape mean the lens has no point focus
what is emmetropia
far sighted - need more accomodation
