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TWENTY / TWENTY VISION

Make a Snellen chart to test your friends’ eyesight

Suitable For

Grade 7

Difficulty

1

Time Required

 <12 Hours

Supervision

Advised

What’s it about?

An optometrist is a doctor concerned with your eyes as well as your vision. A ‘Snellen’ eye chart is the most common way for optometrists to determine how ‘normal’ your vision is. It sets a standard for what most people should be able to see when they stand 20 feet away from the chart. 20/20 vision just means that when you stand 20 feet away from a Snellen eye chart, you see what the average human being can see. Test your friends’ eyesight with your own Snellen chart in the following science experiment:

Topics covered

Snellen chart

What will I need?

  • YOUR FRIENDS’ EYES
  • MAGIC MARKER
  • WHITE PAPER
  • RULER
  • PENCIL
  • MEASURING TAPE
  • STICKY TAPE

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

The ‘Snellen’ chart sets a standard for what most people should be able to see when they stand 20 feet away from the chart. If you have 20/20 vision, it means that when you stand 20 feet away from a Snellen eye chart, you see what the average human being can see. If you see 20/40, it means that when you stand 20 feet away from the chart, you see what a normal person sees standing 40 feet away from it. The higher the second number, the worse your vision is. At 20/200 you are legally blind, although you can also have better vision than 20/20. If you have 20/10 you see at 20 feet what most people see at 10!

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