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In this activity, learners conduct a simple test to find their blind spot.

In this activity, learners discuss and investigate how cameras, telescopes, and their own eyes use light in similar ways.

In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

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, 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.