IUBio

Cross - Wired Eyes

Kalman Rubinson kr4 at nyu.edu
Tue May 15 19:15:47 EST 2001


On 16 May 2001 00:26:49 +0100, rhall at webmail.uvi.edu ("Richard L.
Hall") wrote:

>How many vertebrates lack eye lenses?  Fish have them as do all 
>tetrapods that I know of.  So maybe the answer is zero.  There are 
>some species that have greatly reduced eyes and presumably greatly 
>reduced optic tracts.  Still, so many other central systems 
>decussate, that it seems unlikely that something like the formation 
>of a lens could account for crossed visual pathways.

Yes.  Even a pin-hole lens produces image inversion.

Kal




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