WEBVTT

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JOAN CARTAN-HANSEN, HOST:

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WHERE YOUR EYES SIT IN
YOUR HEAD MAKES A DIFFERENCE

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IN WHAT AND HOW YOU SEE.

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MANY PREY ANIMALS AND PEOPLE
HAVE THEIR EYES IN THE FRONT

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OF THEIR HEADS.

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THIS GIVES THEM BINOCULAR
VISION.

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THE FIELD OF ONE EYE OVERLAPS
THE OTHER SO THEY CAN SEE

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MORE.

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AND THEIR EYES WORK TOGETHER
SO OBJECTS HAVE DEPTH AND SO

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THEY CAN JUDGE DISTANCE.

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SOME ANIMALS HAVE EYES ON
OPPOSITE SIDES OF THEIR HEADS.

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THAT GIVES THEM MONOCULAR
VISION.

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EACH EYE WORKS INDEPENDENTLY.

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AND THAT ALLOWS THEM TO KEEP
ONE EYE ON DINNER AND THE

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OTHER EYE ON POSSIBLE DANGER.

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SOME ANIMALS HAVE BOTH
MONOCULAR AND BINOCULAR

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VISION.

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CHAMELEONS GENERALLY HAVE
MONOCULAR VISION, BUT THEY

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CAN ROTATE THEIR EYES NEARLY
180 DEGREES AND CAN MAKE THEIR

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EYES WORK TOGETHER TO SEE A
SINGLE OBJECT.

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HORSES TOO CAN SWITCH BETWEEN
MONOCULAR AND BINOCULAR

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VISION.

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BUT THAT LEAVES THEM WITH A
BLIND SPOT, OR AN AREA THEY

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CAN'T SEE, DIRECTLY IN FRONT
AND BEHIND THEM WHEN THEIR

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HEADS AND NECKS ARE STRAIGHT.

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FOR MORE INFORMATION ABOUT
EYES, CHECK OUT THE SCIENCE

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TREK WEBSITE.

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YOU'LL FIND IT AT SCIENCE TREK
DOT ORG

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(MUSIC)