Light and Refraction

Question 1

Occurs when light passes from one medium to another of different refractive index

Answer 1

Refraction

Question 2

Responsible for the majority of the refractive power of the eye

Answer 2

Cornea

Question 3

What is the refractive power of the cornea

Answer 3

43-44D

Question 4

A refractive component of the eye that has 20-23D refractive power

Answer 4

Crystalline lens

Question 5

What is the total refractive power of the eye?

Answer 5

60-63D

Question 6

This law states that light rays are focused on the retina because they are refracted by passing through the cornea and lens

Answer 6

Snell’s Law

Question 7

Term for a normal eye

Answer 7

Emmetropia

Question 8

Corneal refractive power is (constant, modifiable)

Answer 8

constant

Question 9

Lens refractive power is (constant, modifiable)

Answer 9

modifiable

Question 10

Axial length of the eye is (constant, modifiable) except under certain conditions

Answer 10

constant

Question 11

A term when a refractive error is present

Answer 11

Ametropia

Question 12

Nearsightedness

Answer 12

Myopia

Question 13

Farsightedness

Answer 13

Hyperopia

Question 14

Curvature of the cornea and/or lens is not spherical

Answer 14

Astigmatism

Question 15

Term used when lens is not spherical

Answer 15

Toroidal

Question 16

The loss of accommodative ability of the crystalline lens

Answer 16

Presbyopia

Question 17

Presbyopia is more _____ in nature since it comes with advanced age

Answer 17

physiologic

Question 18

Presbyopia is also called as?

Answer 18

Short-arm syndrome

Question 19

A refractive power difference of more than 2D between the two eyes

Answer 19

Anisometropia

Question 20

A difference of image size between the two eyes as perceived by the patient

Answer 20

Aniseikonia

Question 21

Absence of lens

Answer 21

Aphakia

Question 22

Phakos means?

Answer 22

Lens

Question 23

Artificial lens in the eye

Answer 23

Pseudophakia

Question 24

Lens with thin center and thick edges

Answer 24

Concave lenses

Question 25

Made up of two prisms aligned apex to apex

Answer 25

Concave lens

Question 26

Hallowed center

Answer 26

Concave lens

Question 27

Lenses with thick center and thin edges

Answer 27

Convex lens

Question 28

Bulging center

Answer 28

Convex lens

Question 29

Made up of two prisms aligned base to base

Answer 29

Convex lens

Question 30

Concave lenses create what type of images?

Answer 30

Virtual and erect

Question 31

Minifies images

Answer 31

Concave lens

Question 32

With movement

Answer 32

Concave lens

Question 33

Convex lenses create what type of images?

Answer 33

Real and inverted

Question 34

Magnifies images

Answer 34

Convex lens

Question 35

Against movement

Answer 35

Convex lens