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

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

Which one of your eyes are dominant? Do they act independently or are they equally "in control?" This activity explores how your eyes work (or don't work) together.

In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

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.