You will need:
- Marker
- Large pieces of chart paper
- Blue and red
coloured
felt pens
Figure out why sometimes your eyes play tricks or why you may see something that isn’t there with this experiment.
INSTRUCTIONS
- Take a large piece of chart paper and divide it vertically in half. Write ‘A’ on the left-hand side, and ‘B’ 15 cm to the right.
- Take another large piece of chart paper and divide it the same way. Using marker draw a thick long rectangular blue line on the left-hand side, maintaining a small gap in the single continuous line.
- Draw a red circle on the right-hand side.
- Now ask a friend to close his left eye, and keeping his head about 20 inches away from the chart paper, look from his right eye at the letter ‘A’.
- While doing this, ask him to move slowly his head forward until ‘B’ disappears.
- Try the next experiment. Ask a friend to keep his head 20 inches away from the paper.
- But this time, ask him/her to cover his right eye and look at the red ball from his left eye.
- Once again, ask him to move slowly his head forward, until the two disjointed lines become one.
RESULT
A blind spot exists in our eyeballs, specifically in the place where the optic nerve attaches itself to the eyeball a t
the back. Under normal circumstances, we do not notice a blind spot in our vision. However, when we try
and focus through only one
