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Biology Simulations
Communication & homeostasisGCSE

Eye in Focus

How does the eye focus light and respond to changing brightness?

Explore the parts of the eye, change its focus and watch the pupil respond to light.

Open simulation

Explore at your own pace. Pause, look closer, play again.

Cutaway three-dimensional eye showing the lens, retina, optic nerve and labelled internal structures.
Eye in FocusView from the simulation

Look closer.

  1. Identify the parts of the eye and test your knowledge with the anatomy quiz.
  2. Compare near and distant focusing, then freeze the lens to investigate accommodation.
  3. Change light levels to explore pupil size and the opposing actions of the iris muscles.