phoropter

Question 1

used to determine patients refractive error

Answer 1

phoropter AKA refractor

Question 2

procedure for determining a patients refractive error

Answer 2

Refractometry (OMT)

Question 3

Medically prescribed using clinical judgement to get results from refractometry.

Answer 3

Refraction

Question 4

Optical defect in non accommodating eye

Answer 4

Refractive error

Question 5

A ____ eye has no refractive error

Answer 5

Emmetropic

Question 6

An ___ eye has a refractive error

Answer 6

Ametropic

Question 7

Lenticular astigmatism

Answer 7

from unequal bent light from lens

Question 8

Mixed astigmatism

Answer 8

1 focal point falls in front and 1 falls behind retina

Question 9

Compound astigmatism

Answer 9

Both focal points fall in front of retina

Question 10

Simple astigmatism

Answer 10

1 focal point is on retina and other is in front or behind retina

Question 11

Index myopia

Answer 11

Change of index in lens can be from cataracts or diabetes

Question 12

Axial myopia

Answer 12

axial length of eye is too long for normal refraction of eye

Question 13

Curvature myopia

Answer 13

Steeper then normal cornea causes light rays to focus in front of retina

Question 14

Minus lens

Answer 14

Diverge and concave

Question 15

Absolute hyperopia

Answer 15

Not compensated by patents own accommodative ability

Question 16

Manifest hyperopia

Answer 16

Can be corrected w convex lens

Question 17

Curvature hyperopia

Answer 17

Flatter than normal cornea avg. 44.00D

Question 18

Axial hyperopia

Answer 18

Short eye avg. 23-24mm

Question 19

subjective refractometry 
(manifest)

Answer 19

patients discerns differences in clarity of images

Question 20

objective refractometry

Answer 20

doesn’t require decision making process by patient

Question 21

6 starting points

Answer 21

retinoscopy 
glasses rx 
last manifest refraction
auto refraction
est. sphere or cylinder 
keratometry readings