Question

Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve, Blind spot.

Answer 1

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Answer 2

Human eye system:

The human eye with given parts are mentioned in image attached below.

Cornea:

• It is the transparent front part of the eyes.
• It defines approximately two-thirds of the eye power.

Iris:

• It defines the colour of eyes.
• It is thin and circular in shape which controls the size of the pupil.
• It also control the amount of light reaching retina.

Pupil:

• It is a dark hole in the centre of the iris.
• It allows the light to reflect on retina.

Ciliary muscles:

• It is present in the middle layer of eyes.
• It control the reflex and relaxation of eye lens to accommodate the image into the retina.

Eye-lens:

• It is a biconvex lens.
• It refracts the light to fall on retina.

Retina:

• It is thin layer in the back of the eyes.
• It transfers neurotic signals from eyes to brain.

Optic nerve:

• It acts as a bridge between retina and brain.
• It is made up of support cells and retinal ganglion cell axons.

Blind spot:

• It is a small portion that corresponds to the position of optic disc.
• It has no photoreceptor cells.