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Images 26 of 165 - Eye focusing
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    Eye focusing
Description:
In bright light, the iris makes the pupil of the eye smaller to prevent too much light entering the eyeball. The iris does this by contracting the muscle near the pupil, and relaxing the radial fibres that are joined to its outer perimeter. The iris muscles are shown in red.
3 of 14 pages
Inside the eye
Eye focusing
Eye focusing 2
Eye on retina
Image formation
Eye focusing distant
Eye focusing close-up
Ear structure
Ear drum
Balance organs
Upright macula
Displaced macula