Exercise 10

Question 1

the sense of vision involves refraction of the light and focusing of light on the ____ and detection of light waves by the

Answer 1

retina; receptors

Question 2

Cranial Nerve II

Answer 2

optic nerves; carry impulses from the retina to the CNS; responsible for conducting the impulse from the retina to. the optic chiasma

Question 3

the nasal field of vision is projected on the ____ of the retina, and the temporal field of vision is projected on. the _____ of the retina

Answer 3

lateral side; medial side

Question 4

Snellen chart

Answer 4

used to test visual acuity or the ability to focus incoming light on the retina

Question 5

emmetropia

Answer 5

normal vision

Question 6

hyperopia

Answer 6

farsighted; focal point of the incoming light is behind the retina bc the eyeball is too short; visual acuity is greater than 1

Question 7

myopia

Answer 7

nearsighted; the focal point of the incoming light is in front of the retina bc the eyeball is too long; visual acuity is less than 1

Question 8

Jaeger eye chart

Answer 8

testing for hyperopia or near visual acuity; the larger the print must be in order to read it, the less near visual acuity the person has

Question 9

cornea

Answer 9

responsible for majority of. the refracting or bending of light rays so they fall on one spot of the retina

Question 10

lens

Answer 10

responsible for fine-tuning the focusing of the light on the retina

Question 11

astigmatism

Answer 11

person who has an uneven cornea; will see streaks of light radiating from the light source rather than a more uniform halo of light; use a Green’s chart

Question 12

Corrective lenses

Answer 12

used to properly focus the light on the retina

Question 13

Single vision lenses

Answer 13

used to correct the vision of ppl w. hyperopia or with myopia

Question 14

three components of. prescription lens depending upon the vision problems of. the individual

Answer 14

the sphere, cylinder, and the axis component

Question 15

sphere

Answer 15

corrects for myopia or hyperopia and is the strength of the correction measure in diopters

Question 16

divergent lenses

Answer 16

used to. correct the vision of a person w myopia; focal point of light is moved further from the cornea and lens and corrects for the greater length of the eye; strength is negative

Question 17

convergent lenses

Answer 17

corrects hyperopia; condenses light before it enters the eye so the focal point of light is moved closer to the cornea and lens and corrects for the shorter length of the eye; strength is positive

Question 18

cylinder and axis component

Answer 18

cylinder - strength of the correction
axis - location. of the correction

person with astigmatism has these

Question 19

optic disc

Answer 19

axons from the ganglion cells converge here in the retina and exit the eye. as the optic nerve; no sensory receptors (blind spot)

Question 20

Amsler grid

Answer 20

used to detect changes. in the retina as well a in the optic nerve and the pathway of visual info in the brain

Question 21

temporal field of view

Answer 21

allows you to see toward the lateral side of your body and provides your peripheral vision

Question 22

nasal field of view

Answer 22

allows you to see toward and somewhat past the midlines of the body

Question 23

perimeter

Answer 23

used to identify the field of view for each eye

Question 24

accommodation

Answer 24

the ability to change the focal point of the eye from focusing on a. distant object to focusing on a close object; due to the contraction of the ciliary muscle and a resulting change in the shape of the lens

Question 25

near point of accommodation

Answer 25

the shortest distance from the eye an object can be brought and still be in focus

Question 26

presbyopia

Answer 26

the lenses lose elasticity and are less able to thicken for close vision. as a result the distance for near point of accommodation increases

Question 27

to view close images

Answer 27

the ciliary muscle contracts, the eyes converge, and the pupils constrict

Question 28

ophthalmoscope

Answer 28

a tool used to view the inside the eye; look to see abnormalities in the macula and fovea centrals, optic disc, and blood vessels of the eye.