Description

This is a simulation demonstrating the optics of the human eye. It also shows how various lenses can be used to correct certain vision problems.

Move the object closer to or farther from the eye with the Object Distance slider.

Use the Focus Distance slider to change the distance at which the eye is focused. The eye focuses by changing the shape of the lens of the eye to adjust its focal length. When the refracted rays in the eye come together on the retina, the image is in focus.

You can also explore how corrective lenses can be used to overcome vision problems like nearsightedness and farsightedness.

Adjust the Overlay Eye Anatomy slider to see a detailed image of the anatomy of the eye.

Some Questions:
What is different about the rays of light that reach the eye from an object near the eye, as compared to rays that come from an object far from the eye?
What is nearsightedness? In nearsightedness, what is the issue with the eye? What type of lens can correct for this?
What is farsightedness? In farsightedness, what is the issue with the eye? What type of lens can correct for this?
What about a person that needs bi-focals? What is the issue with the eye? What type of lens can correct for this? Which half of the corrective lens do you use to view a close-up object?