eyeball

Question 1

pupil

Answer 1

opening thT allows light to enter eye

Question 2

iris

Answer 2

open or closes to control tge size of the pupil

Question 3

cornea and lens

Answer 3

acts to converge light rayz to create an image

Question 4

retina

Answer 4

screen where image is located. creates an electrical (?) to be interpreted by the brain

Question 5

optic nerve

Answer 5

transmits the electrical signal created by the retina to the brain so that we sss

Question 6

rods
— what itdetetcs
— how many
— location

Answer 6

— black and white recpetors; brightness, contrast and nighttime vision

— ~120 mill

— outer edge of retina

Question 7

cons

— what it detects
— how many
— location

Answer 7

— COLOUR receptors; colour detect, detail and daytime vision

— ~7 mill

— center of retina

Question 8

what typa lens does dyeball use

Answer 8

converging lens which creates a smaller inverted and real image

Question 9

what does brain do to the image the eyeballs see

Answer 9

flips it so its rightside up

Question 10

what is accommodation

Answer 10

— eyes change shape of lens using cilary muscles which alters focal lebgth which allows focosijg on retina

Question 11

what is myopia/nearsightedness

Answer 11

— person can focus light ray from nearby objects but not stuff at a distance

Question 12

what causes myopia/nearsightedness

Answer 12

— eyeball is too long
OR
— too much converging of light by the lens

which causes light to be focused INFRONT of the retina

Question 13

what typa lens is used to fix myopia

Answer 13

— a diverging lens

Question 14

what is hyperopia ( farsightedness)

Answer 14

— person can see at a distance but cant see nearby objects

Question 15

what causes hyperopia ( farsightedness)

Answer 15

— eyeball too short
cahses image to be created behind retina

Question 16

what typa lens fixes hyperopia ( farsightedness)

Answer 16

— a conveging lens

Question 17

what is presbyopia?

Answer 17

— a form of farsightedness where ppl cant read snall print

Question 18

what do postive meniscus contact lens look like

Answer 18

— fat middle, thin top and bottom

Question 19

what do negative meniscus contact lens look like

Answer 19

— skinny middle, large top and bottom

Question 20

whay does laser eye surgery do

Answer 20

— reshapes cornea hsing UV rays