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Focusing via Visual Accommodation HTML5


By changing its curvature, the eye’s lens causes light rays to converge so that they focus on the retina – a process known as accommodation.  You can observe this by dragging the candle along the optic axis. This focusing is only possible beyond a limit called the "punctum proximum" or "near point". Otherwise, the image is formed behind the retina and so is blurre.

The diagram is not drawn to scale!

Click on the different parts of the eye to show the labels.

Click and drag the object along the optic axis.

Learning goals

  •  To understand that accommodation is the result of the ability of the lens to adjust in order to keep objects focused on the retina, and that this ability has limits.

Learn more

For any optical system including a lens, it is necessary to focus to have a clear picture on a screen. In the case of the eye, the crystalline lens acts as a lens and the retina as the screen. The…

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