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Old 02-27-2017, 01:16 PM
Darren Garrison Darren Garrison is offline
Join Date: Oct 2016
Posts: 6,364
Originally Posted by Broomstick View Post
Although other posters have covered the uses of a proto-eye, the book In the Blink of an Eye goes into depth about the possible evolution of sight, including numerous examples from both the fossil record and modern animals. I found it an interesting read.
Interesting book maybe, but best read while holding a grain of salt. (Yes, I've actually read it myself, but so long ago that my memories of the details are vague at best.)

I'll also note that trilobites had crystalline eye lenses that, in some cases, have been preserved intact in fossils. Meaning it is possible to actually look through the actual eye lens of a creature that lived half a billion years ago, still in working order. So, not a layer of transparent cells, but a layer of deposited mineral.
A good summary of trilobite eyes from probably the best trilobite info site on the web (the work of one person, and has been around practically forever in web-years.)