Vol.3 Where are blind spots?
The term “blind spot” describes a point at which a person inadvertently misses something. In fact, the term “blind spot” is derived from the human eye having a “blind spot” at which things cannot be seen. Why do we not see things from a blind spot?
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Why can't we see things in blind spots?
A blind spot is observed in the papilla of the optic nerve. The optic papilla is where the optic nerves are bundled. It is also where the blood vessels and optic nerves enter and exit the eye. Because no light-sensing cells (photoreceptor cells) are present in the optic nerve papilla, the light gathered in this area does not reach the brain as a signal. Therefore, the brain judges it to be invisible.
How to examine blind spots using "Marriott Boyle's Law"
Blind spots can be identified using a method co-discovered by Marriott and Boyle.
- Look at the illustration below with your face parallel to the screen.
- Close your left eye and gaze at it with your right eye, gradually moving the distance between the eye and screen closer and further apart.
(There should be a point where the ★ on the right side is completely obscured. This interval varies from person to person.)
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