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10 science-- optics > the human eye > Flashcards

Flashcards in the human eye Deck (38)
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1

the cornea (located ______) causes _____ refraction than the lens

on outside / more

2

the cornea refracts the light _______ way, ________________

the same / regardless of the location of the object

3

the lens can _______ and _________, allowing it to focus light from both nearby and distant objects on ______

change shape / refract light / retina

4

the human eye forms a ____ and ______ image on the retina, but the brain processes the images it receives and gives you sense that it is ________

real / inverted / upright

5

which parts of the eye are responsible for detecting colour (in retina)?

cones

6

which parts of the eye are responsible for detecting light (in retina)?

rods

7

the human eye can detect which colours best?

red, blue, green

8

what causes the "after image"?

overstimulation of photoreceptors in the eye

9

what is the iris?

coloured part of eye surrounding pupil; lies between cornea and lens

10

what is the function of the iris?

widens/narrows pupil to control amount of light entering eye

11

what is the pupil?

round, dark centre of eye

12

what is the function of the pupil?

opens and closes to regulate amount of light reaching retina

13

what is the cornea?

clear part of eye covering iris and pupil

14

what is the function of the cornea?

lets light into eye, permitting sight

15

what is the lens?

round, spherical body in eye; located behind cornea

16

what is the function of the lens?

focuses light rays into retina

17

what is vitreous gel?

part of eye between lens and retina; clear (to allow light to pass through) jellylike substance

18

what is the function of the vitreous gel?

helps maintain structural stability of eye and retinal health but can be removed without harming vision

19

what is the optic nerve?

nerve carrying electrical impulses from photoreceptor cells (rods and cones) in retina to visual cortex in brain; located at back of eye

20

what is the function of the optic nerve?

transmits signals to brain to be converted to images

21

what is the retina?

sensory membrane lining eye

22

what is the function of the retina?

receives images formed by lens and converts them into signals that reach the brain via optic nerve

23

what is the sclera?

the white of the eye

24

what is the function of the sclera?

protective covering

25

what is the "blind spot"?

the point of entry to the optic nerve on the retina; insensitive to light

26

what is peripheral vision?

the part of vision occurring outside the very centre of the field of view

27

what is myopia?

when the eyeball is too long: light rays converge at a focal point before reaching the retina= farther images are blurry

28

how can myopia be treated?

using a diverging lens to bend light rays to meet after reaching the cornea

29

what is hyperopia?

when the eyeball is too short: light rays converge at a focal point behind the retina= closer images are blurry

30

how can myopia be treated?

using a converging lens to bend light rays to meet before reaching the cornea