The eye

The eye
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Slide 1: Slide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2,3

This lesson contains 30 slides, with interactive quiz, text slides and 1 video.

time-iconLesson duration is: 50 min

Items in this lesson

The eye

Slide 1 - Slide

Slide 3 - Slide

 

You can name different parts of the eye
You can explain the difference between the yellow -and blind spot 
You can explain these parts: cornea, pupil, iris, lens and eye nerve. 
You know the difference between rods and cones
You can explain what you need to be able to see an object
You know what is meant by accomodating the eye lens


Slide 4 - Slide

Slide 5 - Slide

Slide 6 - Slide

Slide 7 - Slide

Eyes

Slide 8 - Mind map

Slide 9 - Slide

The eye
cross section 2
2
cross section 3
3
zooming in
4
cross section 1
retina(1), choroid(2), 
vitreous chamber (3), 
macula (4), blind  spot (5), 
eye nerve & artery +vein(6), eye muscle (7), 
sclera (8), 
cornea (9), iris (10), 
anterior chamber (11), 
lens (12), internal
eyemuscles (13)
1
Rods
Cones

Slide 10 - Slide

retina
The retina consist mainly of light sensitive cells: the rods and cones
Rods
Rods are sensitive to  light intensity
There are about 120 miljoen rods
Cones
Cones are used to distinguish kleur
There are about 7 miljoen cones 
As a precondition there should be enough light present.
Macula
The yellow spot, or macula in the middle back of your eye is very sensitive for color because in this spot there are a lot of cones, there are cones elsewhere but much less. This means that you can only see color very well if you look straight at an object.
eyepatch
Did you know an eyepatch was used by pirates to be able to see better in darkness?

Just cover your own eye for a couple of minutes before you go to bed. 
Walk to your room without any light switched on and then remove the eyepatch. You will then notice that the covered eye is now highly sensitive for any light while your other eye seems to be totally blind. For more info take a look at Willem Wever
Looking in the dark
Since in the yellow spot (macula) there are mainly a lot of cones, it is not very suitable to differentiatie between dark and light area's. Therefore it is recommended to not look directly at the object you want to see, That way the lightrays will hit the area next to the macula and then the light will be picked up by the rods present. This makes you see better in the darkness.
Blind spot
The blindspot is situated at the spot where the eye nerve and bloodvessels are leaving the eye. In this spot there are no rods or cones and therefore you can't detect light or color when the light is hitting the blindspot after entering the eye through the cornea and lens.

Slide 11 - Slide

eyebrow
glands
sclera
pupil
iris
eyelid
eyelashes
tear duct

Slide 12 - Slide

Jigspace
  1. Work together
  2. Install the app - jigspace
  3. Search for the eye
  4. Study the cross section of the eye
    and make a drawing in your notebook
Compatibility:
- iPhone 6 of later
- iPad 6th generation
- iPad pro

Slide 13 - Slide

How does a tv set work?

A tv set only uses 3 colors;
rood groen en blauw

So for yellow light it sends out
green and red light.. your brain
does the rest.

Slide 14 - Slide

Bekijk mij van een afstandje.
Wat valt je op?

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Field of view
The field of view is the area you can see without moving your head or eyes for that matter.

As you can see, the field of view depends on the type of animal.. being prey or predator.

You can enlarge your field of view using mirrors, like in a car.

Slide 16 - Slide

Prey or predator?
If prey, then you need to be able to flee quickly if there is danger. Therefore their eyes are situated more to the sides of their faces. 

Predators can be recognized by the fact that their eyes are situated more to the front of the face. This causes more overlap between the two eyes which is very good to see depth which enables the preadator to make a good estimnate of the speed and distance of the object it is chasing.|

Slide 17 - Slide

Slide 18 - Slide

blind spot
Draw a cross and a circel 15 cm apart.
Then read the instructions.
instruction
  1. cover your left eye and look at the circel.
  2. Move your head slowly away from the circel until the cross dissapears. If it does the reflected light from the cross is hitting      your blindspot and then it can't be noticed anymore.
Where is your blind spot?

Slide 19 - Slide

What is your field of view?
Bekijk dit krantenartikel eens
instructie
Controleer of je met je linkeroog aan de buitenzijde tot 90 graden kan zien en aan de binnenzijde tot 60 graden. Doe hetzelfde daarna omgekeerd met je linkeroog
cover your right eye
Put up your left thumb
Move your hand to the extremes to find out the limits of your field of view

Slide 20 - Slide

Am I colorblind?
1
2
3
4

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Do I need glasses?
  1. Measure the width of the example on your screen
  2. Multiply this distance 25 times and look at your screen from that distance
  3. Look at the screen alternatingly with your left or right eye.
If you can see all letters or signs, then your vision is good.

Slide 22 - Slide

  1. Measure the width of the example on your screen
  2. Multiply this distance 25 times and look at your screen from that distance
  3. Look at the screen alternatingly with your left or right eye.
  4. If you can see all letters or signs, then your vision is good.

Slide 23 - Slide

  1. Cover one eye and look at the whole picture
  2. Can you see the black dot in the middle?
  3. Can you see the whole roster while looking at the dot?
  4. Are the lines of the roster black?
  5. Are all lines of the roster seem parallel to you?
Check 

your 

retina

Slide 24 - Slide

Do I have
astigmatisme?
  1. Look at the 4 circels one after the other
  2. Do you see even, clear black lines?
If this is not the case, when the lines are not straight or look a bit greenlike you may suffer from astigmatisme.

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Slide 30 - Video