Eye structure
Eye structure
Outer layer
Middle layer
Inner layer
Category: biologybiology

Class eye structure

1. Eye structure

You will:
- study the features of visual perception

2. Eye structure

• Eye is a complicated organ.
• It consists of three layers: inner, outer and middle.

3. Outer layer

• Outer layer consists of sclera and cornea.
• Sclera is a white layer. It protects the eye from damage.
• Cornea is a transparent layer.

4. Middle layer

• Middle layer consists of three
parts: iris, ciliary body and
• Ciliary body holds the lens in
the eye.
• Lens focuses incoming light.
• Iris has eye coloring pigments.
In the middle of the iris there
is an opening called pupil.
Light enter through this
• Choroid has blood vessels.
They bring nutrients for the

5. Inner layer

• Inner layer is a retina. It has cells called receptors. They receive
information from outside and transfer it to our brain by optic nerve.

6. Facts

• Newborns don’t produce tears. They make crying sounds, but the
tears don’t start flowing until they are about 4-13 weeks old.
• Ophthalmologist is a medically trained doctor who is an expert in
diagnosing, treating and preventing eye diseases.



• https://www.youtube.com/watch?v=LxI30P64Sfk
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