State the function of each of the following parts of the human eye:

[AmarCBSE]

State the function of each of the following parts of the human eye:

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

Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.

Answer:

1. Cornea: Refraction of the light rays falling on the eye.
2. Iris: To control the size of the pupil.
3. Pupil: To regulate and control the amount of light entering the eye.
4. Retina: To act as a screen to obtain the image of object and generate,electrical signals which are sent to the brain via optic nerves.
   We can contribute by participating in different ways of motivating people for the noble cause of eye donation such as, street play, banners, poster, door to door campaign, etc.

Objectives of organising such campaigns:

1. To develop the habit of group work,
2. To work for a common cause,
3. To understand social issues and problems.