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

In this activity about light and perception, learners create pictures in thin air.

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 about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

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