3.5.11

The Eye

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Retina Scanning

Your retina is full of receptor cells, which are sensitive to both the brightness (light intensity) and the colour of light.

Scanning the retina

Retina scanning looks at the pattern of blood vessels in your retina to identify you.

The Eye

The iris controls pupil diameter and the quantity of light reaching the retina. If there isn't much light then the iris will make our pupils dilate (get bigger).

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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