L2 - The eye

Question 1

What radiation does light use?

Answer 1

Electromagnetic

Question 2

What is a photon + what how does it travel?

Answer 2

Particle of light
travels in waves

Question 3

what’s the speed of light

Answer 3

299,792,458 m/sec

Question 4

What is amplitude regarding light?

Answer 4

intensity

Question 5

How is wavelength measured?

Answer 5

the distance between peaks

Question 6

What is frequency in regards to light?

Answer 6

The no. of waves traveled in a min.

Question 7

What is the radiation of visible light?

Answer 7

380-760nm emitted by the sun, lightbulbs etc.

Question 8

What is the vague order for frequency in terms of the colours of visible light?

Answer 8

Follow the rainbow for slowest to fastest frequency e.g., dark red has the slowest frequency and violet has the fastest

Question 9

Corena

Answer 9

transparent outer coating @ the front of the eye - used for focus

Question 10

Sclera

Answer 10

white, opaque outer coating

Question 11

Pupil

Answer 11

the circular hole in the centre of the iris that lets light entre

Question 12

iris

Answer 12

the pigmented part of the eye that’s visible through the cornea (eye colour)

Question 13

lens

Answer 13

transparent focusing element of the eye

Question 14

retina

Answer 14

the photoreceptors and neural circuity that covers the back surface of the eye

Question 15

fovea

Answer 15

the part of the eye where the centre of an image falls

Question 16

optic nerve

Answer 16

nerve fibres that carry nerve impulses from the retina to the brain

Question 17

anterior chamber

Answer 17

between corena + iris
(contains aqueous)

Question 18

posterior chamber

Answer 18

between iris + lens
(contains aqueous)

Question 19

how does the lens function?

Answer 19

focuses an image on the retina (accomodation)
lens changes shape to adjust they eye’s focus for stimuli located at different distances

Question 20

How does the retina fucntion?

Answer 20

lines the back of the eye, detects light in the retinal image + transforms it from light energy t electrochemical energy
(phototransduction)

Question 21

What are the 2 types of photoreceptors?

Answer 21

rods + cones

Question 22

What do the rods do?

Answer 22

responsible for vision at low light levels
very sensitive for darkness
Coarse spatial structure

Question 23

What do cones do?

Answer 23

responsible for vision in bright light + colour vision
used for fine details

Question 24

How do photoreceptors work?

Answer 24

when light hits a photopigment it splits which activates the photoreceptor cell - the moment of transduction from lightwave to neural impulse.

Question 25

How do the retinal ganglion cells work?

Answer 25

summarises input from a population of photoreceptor and their axons carry the signal out of the eye and into the brain

Question 26

What’s a blindspot?

Answer 26

small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina

has no photoreceptors