Question

Three primary layers are responsible for the majority of eye function. Please summarize the layers and the structures located in each layer.

Answer 1

The eye has Three layers.

The three layers of the eye,

The sclera,

the choroid layer, and

the retina.

The outermost layer is sclera.

Sclera is White and fibrous in nature. Front of the sclera is the clear, bulging cornea, which acts as the window to the eye by bending light towards the pupil.

Functions of sclera:

1. A protective layer
2. The white fibrous sclera also maintains the shape of the eye.

The structures located in Sclera is,

Cornea: Transparent part of the sclera that protects the eye and refracts light toward the pupil of the eye.

Functions of the cornea

1.Protects the eye
2.Refracts light toward the pupil of the eye.

Aqueous Humour:A transparent fluid in a chamber behind the cornea.

Watery liquid that protects the lens of the eye and supplies the cornea with nutrients.

Second Layer :The choroid layer.

Choroid Layer.

Middle layer of tissue in the eye that contains blood vessels that nourish the retina.

Structure:

Iris: Opaque disk of tissue surrounding the pupil that regulates amount of light entering the eye.

Function:Controls size of pupil to regulate amount of light entering the eye.

Vitreous Humour:Contains cloudy, jelly-like material that maintains the shape of the the eyeball and permits light transmission to the retina.

Function:Maintains the shape of the the eyeball and permits light transmission to the retina.

Third/ Innermost layer of the eye The retina.

Retina: Innermost layer of tissue at the back of the eye containing photoreceptors.

Four layers of retina:

pigmented epithelium

light-sensitive cells

bipolar cells

cells of the optic nerve

light-sensitive cells rods and cone.

Both rods and cones act like Sensory Receptors.