
Your Eye's Hidden Blind Spot
Easy
Can you make a dot on a piece of paper vanish just by moving the page closer? Every eye has a blind spot. It is the small area on the retina (the light-sensing layer) where the optic nerve exits. That spot has no light receptors at all.
You draw a small dot and a plus sign about six inches apart on paper. Close one eye and focus on the plus sign. Slowly move the paper toward your face.
At a certain distance, the dot disappears. That is the moment it falls on your blind spot.
Hypothesis
The hypothesis is that the dot will disappear when it falls on the blind spot of the retina.
Method & Materials
You will draw a small dot and a small + sign on a piece of paper, close one eye, look at the + sign, and slowly move the paper closer to you.
You will need a pen, paper, and your eyes.
Results
The experiment showed that when the dot falls on the blind spot of the retina, it disappears from sight. Interestingly, an octopus does not have a blind spot because its photoreceptors are located in the inner portion of the eye and the cells that carry information to the brain are located in the outer portion of the retina.
Why do this project?
This science project is interesting because it allows you to discover something about your own eyes that you may not have known before.
Also Consider
Experiment variations to consider include testing the blind spot of other people, or testing the blind spot of an octopus.
Full project details
Additional information and source material for this project are available below.Related video
These videos explain the science behind this project and demonstrate key concepts used in the experiment.
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