Sclera - ANSWER-Tough, white outer coat of the eyeball
myopia - ANSWER-nearsightedness; the condition in which parallel rays of light are brought into focus in front of the retina, rather than on it
reflection - ANSWER-light that bounces back
refraction - ANSWER-when the direction of light changes as it passes from one medium
to another(bending of light)
presbyopia - ANSWER-Age of 40
need reading glass crystalline lens diminishes
frame difference - ANSWER-the difference betweeen the horizontal and vertical measurement
Ex. 50-45= 5mm
MPD - ANSWER-mechanical PD in a finished pair of glasses
the distance between the optic center
measuring PD - ANSWER-should sit at 40 cm(16in) from patient
average PD for adults - ANSWER-50mm to 75mm
diplopia - ANSWER-double vision
plus lens - ANSWER-thick at the center
magnify converge FL in front of lens
minus lens - ANSWER-think at the center
minify diverge
FL behind of lens
astigmatism - ANSWER-football shape eye
two different powers
refractive index - ANSWER-N= speed of light in air/ speed of light in material