Grade 8 Science: The Human Eye

Grade 8 Science: The Human Eye

Read each question carefully and answer to the best of your ability. Use the provided image for reference where indicated.

Refer to the diagram below to answer the following questions.

1. The   is the transparent outer layer at the front of the eye that protects it and helps in focusing light.

2. The colored part of the eye, called the  , controls the size of the pupil.

3. The   is a light-sensitive layer at the back of the eye that converts light into electrical signals.

4. The   nerve transmits visual information from the retina to the brain.

1. Which part of the eye is responsible for changing the shape of the lens to focus on objects at different distances?

2. What is the function of the rods in the retina?

1. The pupil is a muscle that contracts and relaxes to control the amount of light entering the eye.

2. Nearsightedness (myopia) occurs when light focuses in front of the retina.

1. Briefly explain how the eye focuses light to create a clear image on the retina.

2. Describe two ways you can protect your eyes from damage.