biologie

• Biologie
• Secundair onderwijs

Image formation in the eye

by Lente De Sutter, Mare Rampelbergh, Olivia Van den Bergh and Nele Van Schel

the retina

• the light sensitive layer of the eye
• in the back
• two layers:

      -pigmented layer

      -neural layer

the retina

• rods

-non color vision 

-low light vision

• cones

-color vision
-bright light vision

-very detailed

photoreceptors

=the light sensing nerve cell located in the retina

(rods and cones)

the function

• captures the light
• helps transate it into the images you see
• the cells change the light energy into an elecrical signal
• the signal->your optic nerve->into your brain->becomes a picture of the world that we see

short-sighted vision

• medical term : myopia
• closer objects are clear
• the eyeball grown to long 

(from front to back) 

• gets worse during adolescene

 (puberteit)-> gets better during
 early adulthood

long-sighted vision

• medical term: hyperopia
• closer object are blurry
• it happens when the

 eyeball is too short

• most children are

 born with it->it improves

for both of them

• refractive erros (vision problems that makes it hard to see clearly)
• easily corrected with glasses or contact lenses
• common signs

-tired eyes

-squiting eyes to see clearly

-eye strain and headaches 

ciliary muscle

=muscle that controls the movement lens/pupil

• iris=colored part of the eye

• when the ciliary muscle contracts the lenze decontracts,  it is possible to see from close by

• when the ciliary muscle decontracts the lenze contracts, it is possible to see from far away

How many procent of Americans are
nearsighted

1. 60%
2. 30%
3. 40%
4. 70%

what are the 2 layers of the retina

1. photoreceptor layer and the neural layer
2. pigmented layer and the green layer
3. pigmented layer and the neural layer
4. cones layer and the blue layer

What is a different word for hyperopia

1. myopia
2. long-sighted vision
3. near-sighted vision
4. rods

what are common signs of long-sighted vision

what detects the rod cells

1. bright light
2. low-light and non-color vision
3. bright light and color vision
4. low-light

thanks for your attention

are there any questions?