# data[].attributes.attachment_link.description
summary of key points to learn about eye function and problems

# data[].attributes.attachment_link.description
This is a sample from our GCSE Biology revision podcasts on the topic of The Eye. The podcasts can be downloaded to your PC or mp3 player for only 59p each, meaning you can revise on the move. Visit http://www.reviseonthemove.com to find out more and to listen to more clips.

# data[].attributes.attachment_link.title
GCSE Science Revision - The Structure of the Eye

# data[].attributes.attachment_link.description
The eye is a great example of a receptor and it also illustrates some reflex arcs too. But first we need to revise its structure. Structure of the eye Have a look at this cross-section of the human eye: /**/ You will need to know about light receptor cells (photoreceptors).

# data[].attributes.attachment_link.readable_text
1. 1

2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. 8

9. 9

10. Page 7of 9

The eye is a sense organ containing receptors sensitive to light intensity and colour.

The retina

Light passes through the eyeball to the retina. There are two main types of light receptors - rods and cones . Rods are more sensitive to light than cones so they are useful for seeing in dim light. There are three different types of cone cells which produce colour vision.

The pupil reflex

The amount of light entering the eye is controlled by a reflex action . The size of the pupil changes in response to bright or dim light. This is controlled by the muscles of the iris .

1. 1

2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. 8

9. 9

10. Page 7of 9

# data[].attributes.attachment_link.title
BBC Bitesize - GCSE Biology (Single Science) - Co-ordination and control - The nervous system - OCR Gateway - Revision 7

# data[].attributes.attachment_link.description
1 2 3 4 5 6 7 8 9 Page 7of 9 The eye is a sense organ containing receptors sensitive to light intensity and colour. Light passes through the eyeball to the retina. There are two main types of light receptors - rods and cones .