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In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

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.

This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).