Re: a link to some interesting illusions

[Bernard Cleyet <anngeorg@PACBELL.NET>]

I suspect all mammals do.

Easy to check (for the smart ones).  I discovered this when aligning a
monochrometer illuminated by a D2 lamp.   Since then I've done it a few
times with an Hg pen lamp.  Beyond the violet the color is a blue tint
(low purity) and spread unfocussed over the whole field,   I don't
recommend doing this for more than a few sec..  The first time; I "sun
burned" my eye -- very painful and may contribute to macular
degeneration.

Is it bees that do? -- in that case I suspect their receptors are UV
sens. -- mammals, may be, also, but the cornea, lens, aqueous, and
vitreous absorb it.

bc

Larry Smith wrote:

> At 1:14 PM -0800 2/4/03, Bernard Cleyet wrote:
> > bc  who sees UV, presumably because his cornea fluoresces.
>
> Is this how other species see UV?  How many humans can?
>
> Larry