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In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.

In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light.

These two activities (4th on the page) demonstrate the importance of two eyes in judging depth.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures.

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.