A few years ago there was a thread on the subject on one of the faunaclassifieds forums. To summarize it, there has been a lot of theorizing and little experimentation. The cause could be genetic, and it could be environmental. Nobody knows for sure. There are parallels in other species for both causes.

Paul Hollander

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• One eye genetics - DanW, Tue Dec 16 11:52:26 2008
• RE: One eye genetics - Paul Hollander, Tue Dec 16 16:08:22 2008
• RE: One eye genetics - LarM, Tue Dec 16 21:27:22 2008
• It is genetic but it is not genetic... - boaphile, Thu Dec 18 10:18:38 2008
• great post, thanks! n/p - AbsoluteApril, Thu Dec 18 12:15:15 2008
• RE: It is genetic but it is not genetic... - DanW, Thu Dec 18 14:52:49 2008
• Thankyou Jeff - LarM, Thu Dec 18 17:07:50 2008
• Thank you! n/p - Paul Hollander, Thu Dec 18 18:16:13 2008
• Food for thought - Slithering_Serpents, Wed Dec 17 02:01:42 2008
• RE: Food for thought - EricIvins, Wed Dec 17 04:02:57 2008
• RE: Food for thought - Slithering_Serpents, Thu Dec 18 00:46:24 2008
• Some hets - boaphile, Thu Dec 18 10:22:09 2008
• I believe you, thanks! : ) n/p - Slithering_Serpents, Thu Dec 18 19:28:49 2008
• RE: One eye genetics - ceniceros, Thu Dec 18 13:19:22 2008