Low Vision Lecture 1 Flashcards Preview

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Flashcards in Low Vision Lecture 1 Deck (36):
1

The outer layer of the eyeball is made up of the ____ and the _____

Cornea, sclera

2

The middle layer of the eyeball is the _____ layer

Supportive (muscles and blood supply)

3

The choroid is the blood supply source in the ____ layer of the eye

Middle

4

The middle layer of the eye is made up of the

Vitreous humor, choroid, angle, lens, iris, canal of schlemm

5

The inner layer of the eye is the ____ layer

sensory

6

The most sensitive area of vision is located within the ____

Fovea

7

Cornea's main job is to

Bend light into the eye

8

True of false: the cornea contains no blood vessels

True

9

Which part of the eye is most often implicated in correctable vision impairments?

Cornea

10

What part of the eye is the outermost lens?

Cornea

11

Which part of the eye shields from germs?

Cornea

12

Iris is the _________ part

Colored

13

The ____ is a diaphragmatic structure

Iris

14

The pupil becomes at near, at rest, in bright light

smaller

15

The sole function of the lens is to

Focus light onto the retina

16

The lens is held by bungee like structures called the _________

Zonnules of Zinn

17

The lens becomes more ___________ as an object gets closer

Rounded

18

The retina initiates the ___________ of vision

Sensation

19

There are a lot more ______ than ______-

Rods
Cones

20

The rods are responsible for ____ light, while the cones are responsible for _____ light

Bright
Dim

21

The ______ cover peripheral vision and motion

Rods

22

The macula is small, but has a _________ in the brain

Large respresentation

23

The _________ is the area of clearest vision
It is where light can be directly on the retina

Fovea

24

Optic nerve (sensory component) is cranial nerve number __

2

25

Oculomotor nerve is CN ___

3

26

Eye movement:
Ductions are

One eye at a time

27

Eye movement:
Versions

Both eyes in same directions

28

Eye movement:
Vergences

Both eyes in opposite directions

29

A gaze stabilizing movement is caused by the __________ reflex

Vestibulo-ocular

30

The optokinetic reflex is the attempt of the eyes to follow a ______

Moving object

31

Scanning is the ability to

Shift the area of clearest vision back and forth in order to find or identify an object (saccades)

32

Tracking is the ability to

Follow a moving visual target while keeping the target in the area of clearest vision (pursuits) this is done with slower moving objects

33

The three foundations of vision are

Oculomotor function, visual fields, visual acuity

34

80% of people receiving vision rehabilitation have ________ or "blind spots"

Central scotomas

35

Binocularity is the ability to

Use both eyes together

36

Stereopsis

The ability to put the images from each eye together into one jointed picture