Glare/Vis Performance

Question 1

difference between discomfort glare and disability glare:

Answer 1

discomfort: reduces comfort, DOESN’T reduce visual performance…disability glare does

Question 2

define: veiling reflections

Answer 2

caused by specular reflection off a surface you’re viewing - can do something about!
-affect FORWARD scatter (on their way to the retina)

Question 3

what part of eye is reponsible for the MOST ocular scatter? followed by which other two?

Answer 3

peripheral retina - 40%, cornea and lens: 30% apiece

Question 4

what are the two mechanisms of intraocular scatter? WHICH is wavelength dependent? Is that d/t SMALL or LARGE particles in oc media?

Answer 4

rayleigh: WAVELENGTH-DEP. - small particles
mie: not wavelength dep. forward may or may not equal backward scatter (scatter by LARGE particles)

Question 5

which is the generally accepted method of intraocular scatter?

Answer 5

MIE! - b/c disability glare is independent of wavelength

Question 6

which is a better indicator of glare disability with cataracts: acuity (VA) or contrast sensitivity chart?

Answer 6

contrast sensitivity -all day!

Question 7

disability glare results from ___ ___

Answer 7

intraocular scatter

Question 8

Which type of wavelength (short or long) scatter more as you age? What color?

Answer 8

long - red. Less pigment as you age = more scatter (and hence more disability glare) as you age