Microscopic construction of the eye and how to get it from children

• BIOCLIL
• Secundair onderwijs

Microscopic construction of the eye

Presented by Ruben, Nick and Mathias

What do you know about the microscopic construction of the eye?

How often do you use your eyes?

Never

only during day time

only when your eyes are open

Always

Cornea

-exterior of the eye

-stroma cells: endothelial cells   (interior) and plaveiselepitheelcellen   (exterior)

-protection from infections

-thickest part of the eye

With what do you think our eyes see?

Light

-Retina

-Photopigments

-Absorption of light

Retina

-netvlies (the screen)

-126 million cells

        *light sensitive -> photoreceptors

-cones = pigmented to differentiate colors

-rods = differ between light and dark

Quick question how many photoreceptors do you have in your eyes?

1. 252 million
2. too much
3. 50 thousand
4. 126 million

photoreceptor

-absorption

-light

cones

rods

translation Retina

pigmented to differentiate colors

differs between light and dark

netvlies

Macula

-what?

  *yellow fleck

-location?

  *back of eye

  *inside the retina

-purpose?

  *visualizes the central of our vision

  *perception of fine details

  *macular pigments

What is the main purpose of the Macula?

1. light absorption
2. perception of fine details
3. pigments
4. yellow fleck

Uvea(vascular nerve)

between retina and cornea

three concentric layers

looks like a grape

middle layer of the eye consisting of the iris, the choroid and the ciliary body

supplies the eye with nutrients

improves vision quality by decreasing the amount of light that falls into the eye

is filled with lymphocytes controls inflammation to avoid major damage dealt by infections

Crystalline lens (ooglens)

-location?

  -between the retina and the iris

has 4 parts->

-lenskapsel, subcapsular space, cortex, nucleus

-purpose?

  -focuses light onto the retina

fun fact: what animals are the primary users of crystalline lenses?: land animals

Why did our ancestors need to focus their vision to survive?

1. to hunt
2. food
3. ograns
4. to gather

what animals are the primary users of crystalline lenses?

1. ocean animals
2. ocean anymals
3. oceen animals
4. land animals

Iris

-purpose?

  -controls light coming in

  -changes size depending on light.

-example?

  -sizes down = less light.

  -sizes up = more light.

-It consists of 2 layer:

  -pigmented fibrovascular

  -stroma

Fun fact: The iris is also responsible for your eye color!

Now the see if you actually listened

the quiz!

When do you use your eyes?

1. always
2. only when there's light
3. only when open
4. almost never

Where is the retina located?

1. front of the eye
2. the back
3. in between the retina and the iris
4. the back of the eye

What is the thickest part of the eye?

1. the exterior
2. the iris
3. the cornea
4. the retina

128 million

2

4

layers of the iris

parts of the crystalline lens

amount of cells in the retina

Your eyes' eye color depends on…

1. Cornea
2. Retina
3. Iris
4. Macula