It is almost like a sphere(almost round)

Its outer coat is white.

It is tough so that it can protect the interior of the eye from accidents.

The eye has many different parts like cornea,iris,pupil,lens,retina etc

human-eye---teachoo.png

 

Different Parts of Eyes

Cornea

Outermost layer is called Cornea

It is transparent

 

Iris

Behind the cornea, there is dark muscular structure

It is called iris

The colour of the iris of different people is different.

Some have brown eyes,some black,some blue

 

Pupil

In iris,there is a small opening called pupil

 

Lens

Behind the pupil,there is lens

Lens focuses light on the back of the eye on a layer

This is called retina

 

Retina

Layer on the back of the eye is called retina

Retina contains different nerve cells

 

Nerve Cells

There are 2 types of cells

  • Cones - They are sensitive to bright light.
  • Rods - They are sensitive to dim light

 Example-An owl can see easily during the night because it has more rods on its retina than cones

                Eagle(Day Bird) has more cones and fewer rods

Optic Nerve

Sensations felt by nerves are transmitted to the brain by optic nerve

 

Ciliary Muscle

It helps in changing shape of lens

This helps lens to focus

  1. Class 8
  2. Chapter 16 Class 8 - Light

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo