5.3 vision

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

5.3 vision

The eye

Notes

• Eyebrow : 

• Eyelashes (

• Sclera ( The eye muscles are attached to the sclera

• Pupil: 

The eye

Notes

• Eyebrow (wenkbrauw): Protects the eye against sweat and other liquids (vloeistoffen)

• Eyelashes (wimpers): protects the eye against dirt and bright light

• Sclera (harde oogvlies): white of the eye. The eye muscles are attached to the sclera

• Pupil: The pupil lets light into the eye.

30 seconds

First of all the light  is controlled by the............

In bright light, the ..... constricts  resulting in a ........... pupil

In dim light, the ..... relaxes resulting in a ..........pupil

First of all the light is controlled by the iris

In bright light, the iris constricts resulting in a smaller pupil

In dim light, the iris relaxes resulting in a larger pupil

30 seconds and remove hand

https:

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)

Rods- Cones

Rods : Black and white/ unsharp image

Cones: colour/sharp 

fig 5.7 in book

retina

retina

Do experiments from your workbook

Exc 16

Exc 17

Exc 18

Exc 19

When your done you will be talking about the eye

What part of the lens focuses the light rays

1. Lens
2. Pupil
3. Retina
4. Cornea

What is the biggest part of the eye

1. Rods
2. Lens
3. Vitreous body
4. Cornea

How do we see çolour

1. Rods
2. Cones
3. Lens
4. Cornea

excersize 9 to 15

blind spot/optic nerve

Where can you find the highest amount of cones

1. Blind spot
2. Fovea
3. Optic nerve
4. Iris

In dim light the ...... are making an image.
What should be on the .....

1. Cones
2. Rods

Whe you use your rods the image is in .......

1. Black and white
2. Colour

When the image hits the retina, the image is upside down. What flips the image over so that it is right-side up

1. Lens
2. Retina
3. optic nerve
4. Brain

kidshealth.org

https:

(-) minus lenses

(+) plus lenses

Short sighted: you can see clearly objects that are close by

Long sighted: you can see clearly objects far away

glasses

- short - sightedness: you can’t see sharp in the distance, you need - (concave) glasses, your eye is too long, or your lenze can’t flatten enough

- long - sightedness: you can’t see sharp up close, you need + (convex) glasses, your eye is too short, or your lenze can’t contract enough

Peter has problems reading his book, he only sees a blurred line. Peter has no problems looking in the distanceThis means that his lens is

1. to thick so the light is broken to much
2. to thick so the light is not broken to enough
3. to thin so the light is broken to much
4. to thin so the light is not broken to enough

This condition Peter has is called

1. short- sighted
2. long-sighted

Peter needs glasses with ......

1. A convex lens
2. A concave lens

When people get older they often have problems reading a book. They need glasses with a convex lens. Can you explain this

vocabulary?

read the paragraph 5.3 again and write down difficult words

or ask the teacher for assitance if you dont understand everything