Bricks 5.3 Vision

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

5.3

Vision

eyelid

tearduct

tear gland

eyebrow

eyelash

Eyebrow

Eyelashes

Tear fluid

Eyelid

sweat and other moisture runs past your eyes and not in them

protects against dirt and excessively bright light

protects against dehydration and cleans the eye

can close as a protective layer over your eye 

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iris

retina

sclera

cornea

pupil

optic nerve

lens

retina

Cones are for: Color (red / blue / green)

Rods are for: Light (black / white)

retina

cones work well in bright light

rods function in dim light

the fovea is the most sensitive part (lots of cones)

retina

0

blind spot/optic nerve

test blind spot

page 125 of your workbook, excercize 16

Dim light → circular muscles relaxed, radial muscles contracted → pupil large

Bright light → circular muscles contracted, radial muscles relaxed → pupil small

which cat is in a darker room?

1. 
2. 

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Eye lens focusing

(-) minus lenses

(+) plus lenses

short

long

glasses

short - sightedness: --> you can’t see sharp in the distance, 

- your eye is too long, or your lenze can’t flatten enough

- you need 'minus' (concave ) glasses,

long - sightedness: --> you can’t see sharp up close, 

- your eye is too short, or your lenze can’t contract enough

- you need 'plus' (convex) glasses,