Ages

Introduction

Summary

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 miniature Eiffel Tower in the animation. 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 blurred.
The diagram is not drawn to scale !

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.

Features

Click and drag the object along the optic axis.

Tags

eye Crytalline-lens lens retina cornea optic-nerve near-point image focal focusing