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In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions.

In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light.

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

In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.

In this demonstration (18th on the page), learners conduct a simple test to explore how the cornea refracts light, which is further bent by the eye lens through a process known as accommodation.

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