IUBio

Cross - Wired Eyes

Richard L. Hall rhall at webmail.uvi.edu
Wed May 16 18:24:32 EST 2001


Mr. Hammond,

We were talking about vertebrate vision not the eye of arthropods. 
But since you bring the topic up.... In the compound eye of 
arthropods, each ommatidia accepts a very narrow beam of light.  Even 
so, at least in bees,  the focal point is within the crystalline cone 
and begins to diverge so the image is reversed (Varela and Wiitanen, 
J. Gen Physiol 55:336-358, 1970)....but their visual pathways do not 
appear to decussate.

rlh

>
>[Hammond]
>There is no sensible reason to believe that the
>compound eye of a fly produces an inverted image.
>and flys do not have a desussated CNS to my knowledge.
>
>
>--
>BE SURE TO VISIT MY WEBSITE, BELOW:
>-----------------------------------------------------------
>George Hammond, M.S. Physics
>Email:    ghammond at mediaone.net
>Website:  http://people.ne.mediaone.net/ghammond/index.html
>-----------------------------------------------------------

-- 
Richard L. Hall, Ph.D.
Comparative Animal Physiologist

University of the Virgin Islands
2 John Brewers Bay
St. Thomas, U.S.V.I. 00802

340-693-1386
340-693-1385 FAX

rhall at uvi.edu

"Live life on the edge...the view is always better"  rlh

---




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