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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 optics activity, learners build an animation tool to make mini movies. When you spin a phenakistascope, the pictures move so quickly that your eyes and brain can't separate the images.

In this activity (3rd on the page), learners conduct a series of tests to find out which of their eyes is more dominant.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.