Quote:
Originally Posted by RWebb
[1] not clear if they do or don't & you have to define what poor vision is...
- they do have a tapetum lucidum (shiny layer in the back of the retina); often found in semi-nocturnal animals & it reflects the additional photons that miss the sensory cell "targets" back forward so those photons can hit the sensory cells ---> upshot is that photons from various directions can trigger the sensory cell, so you never know which ones did it ---> thus, lower resolution (acuity) is the trade-off for seeing well at night
I dunno what they've got re a macula or fovea,* but somebody must have done that work as it an easy dissection to get the data
- but it was recently found that they can discriminate hues (colors, sorta) so they must have some color vision ability
[2] true
* = high sensor density areas used for high-res vision; good things to have if you fly, or swing thru the trees and are looking to grab that next branch, hence common in birds & primates
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Please tell me that you either stole this info from somewhere else or that you're a bear optometrist during your off time.