The parietal eye is not a hole in the head...it's like scales that are slightly different looking on the chameleon's head. You can see it more clearly on some reptiles than others.
Parietal eyes...
https://www.chameleonforums.com/threads/parietal-eye-pichttps://www.pinterest.ca/pin/4785143327647816/
Tuataura...
https://www.pinterest.ca/pin/506443920580683358/
Articles...
https://thereptiletimes.wordpress.c...ng-reptile-vision-parietal-eyes-january-2014/
https://osa.magnet.fsu.edu/tutorials/chameleonschange.html
"A chameleon has a small light-sensitive spot on the top of its head. This "third eye" doesn’t form an image, so it is only a rudimentary eye. It is called "the parietal eye", and pages 26-27 in The Chameleon Handbook, by Francois LeBerre, shows where it is located on the chameleon’s head. In chameleons, the third eye is covered by scales, but in some other kinds of lizards, it is not covered. The third eye is only sensitive to violet and blue light: it ignores light of longer wavelengths."
Parietal eyes...
https://www.chameleonforums.com/threads/parietal-eye-pichttps://www.pinterest.ca/pin/4785143327647816/
Tuataura...
https://www.pinterest.ca/pin/506443920580683358/
Articles...
https://thereptiletimes.wordpress.c...ng-reptile-vision-parietal-eyes-january-2014/
https://osa.magnet.fsu.edu/tutorials/chameleonschange.html
"A chameleon has a small light-sensitive spot on the top of its head. This "third eye" doesn’t form an image, so it is only a rudimentary eye. It is called "the parietal eye", and pages 26-27 in The Chameleon Handbook, by Francois LeBerre, shows where it is located on the chameleon’s head. In chameleons, the third eye is covered by scales, but in some other kinds of lizards, it is not covered. The third eye is only sensitive to violet and blue light: it ignores light of longer wavelengths."
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