Xref: utzoo sci.electronics:2966 sci.astro:2124
Path: utzoo!attcan!uunet!husc6!mailrus!ames!lll-tis!mordor!jtk
From: jtk@mordor.s1.gov (Jordan Kare)
Newsgroups: sci.electronics,sci.astro
Subject: Re: Seeing UV
Message-ID: <22237@mordor.s1.gov>
Date: 16 May 88 22:07:12 GMT
References: <230@snjsn1.SJ.ATE.SLB.COM> <702@eos.UUCP> <4433@watcgl.waterloo.edu>
Reply-To: jtk@mordor.UUCP (Jordin Kare)
Distribution: na
Organization: S-1 Project, LLNL
Lines: 26

In article <4433@watcgl.waterloo.edu> awpaeth@watcgl.waterloo.edu (Alan W. Paeth) writes:
>(re: discussions on the world as seen by people lacking the eye's crystalline
>lens and on the ability to focus on the blue end of the spectrum).
>
>Incidentally, ... the
>aberration chart ... puts people a good two or three diopters out in the far
>blue. I've occasionally seen the effect -- it is maxmized when looking at blue
>lettering on a dark surround viewed at infinity (closer than about 6 ft. and
>your eye can accomodate). The most memorable example was blue computer graphics
>lettering done in a 35mm slide presentation, but in all fairness, the slide was
>designed to illustrate the effect.

In El Cerrito, CA, there is a building on Fairmont Ave. which has a
large (several foot high) sign composed of internally lit letters.
The letters are deep blue, and the sign as a whole is visible for
several blocks.  However, it is also completely illegible, 
and (at least to my eyes, which are beginning to have
some distance vision problems as I age, although I've never worn glasses)
appears as a large blue blur until you get very close, whereupon it
finally resolves into the words


EYE CENTER

	:-)	Jordin (The Eternal Optometrist)  Kare	
		jtk@mordor.UUCP	jtk@mordor.s1.gov