Quizlet Practice

Question 1

a lens focal length may be altered by

Answer 1

Changing the curvature of one surface

Question 2

lights changing direction as it passes from one medium to another is called what?

Answer 2

refraction

Question 3

meniscus, equiconcave and flat concave are all …

Answer 3

minus lenses

Question 4

what term is used to describe the eyes tendency to TURN from its normal position?

Answer 4

phoria

Question 5

refractive condition where light focuses directly ON the retina( no refractive error)…?

Answer 5

emmetropia

Question 6

one convex and one concave surface is known as…

Answer 6

a meniscus lens

Question 7

corneas index of refraction

Answer 7

1.37

Question 8

what happens if you move a PLUS lens CLOSER to the eye?

Answer 8

loses perceived power

Question 9

what happens if you move a PLUS lens AWAY from the eye?

Answer 9

gains perceived power

Question 10

what happens if you move a MINUS lens CLOSER to the eye?

Answer 10

gains perceived power

Question 11

Vertical prism U&U and D&D cancel out, but U&D you ____

Answer 11

ADD U and D

Question 12

horizontal prism O&O add, I&I add, But I&O____

Answer 12

cancel

Question 13

light travels at …

Answer 13

186,000 mps

Question 14

both sides of lens is minus?

Answer 14

biconcave

Question 15

both sides of lens are plus?

Answer 15

biconvex

Question 16

plus lens decentered out will make the lens….

Answer 16

thicker temporally

Question 17

minus lens decentered out will make the lens…

Answer 17

thicker nasally

Question 18

1 plus eye 1 minus eye

Answer 18

antisometropia

Question 19

same power and sign each eye

Answer 19

isometropia

Question 20

suffix phoria means

Answer 20

eyes moves from normal position

Question 21

suffix tropia means

Answer 21

eyes stay in that position

Question 22

esotropia, eye turns in
base____ can help

Answer 22

out

Question 23

exotropia eye turns out
base ____ can help

Answer 23

in

Question 24

decentration= frame pd divided by 2, minus the pd of that eye, if answer is neg its out if positive its in

Answer 24

decentration calculation

Question 25

light is bent toward the base but the image is displaced toward the

Answer 25

apex

Question 26

patient feels like they are walking up hill on a flat surface, could be because of?

Answer 26

too much base down prism

Question 27

patient feels like they are walking downhill, objects are shorter than they really are, could be because of ?

Answer 27

too much base up prism

Question 28

patient perceives horizontal lines as curved? could be because of?

Answer 28

too much base in or base out prism

Question 29

light focuses before the retina, the patient is

Answer 29

myopic, things are too close, because need minus to meet at retina

Question 30

pd measurement at 30 inches is the

Answer 30

intermediate/computer pd

Question 31

one prism diopters deviates a ray of light____

Answer 31

1cm at a distance of 1 meter