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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 activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

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 artistic activity, learners blow up a smaller picture into a larger one, by using a grid.