Grade Level: 7th-9th Type: Physical Science
In this experiment, will we see how far the average human can see.
- What causes the need to wear glasses in humans?
- How does the brain work with the eyes?
- Multiple eye charts, with different letters of the same sizes
- Test subjects who do not wear glasses or contacts
- Pen and paper for notes
- Setup the experiment by placing yardsticks on the floor as a guide to your distance from the test subject.
- Hold up the eye chart in front of your test subject at two yards. Have your test subject read the letters to the best of their ability. Record the results.
- Change the eye chart. Move further away from the test subject and stand at three yards. Repeat the above step.
- Move further and further away at increments of one yard until the test subject can no longer read any of the letters, changing eye charts with every increment.
- Repeat steps 2-4 for all your test subjects.
- Evaluate your results.
Terms/Concepts: Human eyesight;, anatomy
- Ali, Mohamed Ather; Klyne, M.A. (1985). Vision in Vertebrates. New York: Plenum Press. p.8. ISBN0-306-42065-1.