home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.motorcycles
- Path: sparky!uunet!portal!quadsys!roland
- From: roland@quadsys.com (Roland Besserer)
- Subject: Re: HELMETS
- Message-ID: <By3JxH.5pt@quadsys.com>
- Organization: QUAD Systems
- References: <1992Nov19.033924.25567@spdc.ti.com> <1992Nov19.200105.12133@megatek.com> <BxzJwI.AB@news.iastate.edu>
- Date: Sun, 22 Nov 1992 02:51:17 GMT
- Lines: 48
-
- In article <BxzJwI.AB@news.iastate.edu> tomes@iastate.edu () writes:
- >In article <1992Nov19.200105.12133@megatek.com> randy@megatek.com writes:
- >>In article <1992Nov19.033924.25567@spdc.ti.com> serafin@epcot.spdc.ti.com (Mike Serafin) writes:
- >
- >> Really. Are you really this stupid?
- >>
- >> OK, do this for me. Put your helmet on and without turning your *head*,
- >
- > (lots of almost right rationalizations why not to wear a helmet deleted)
- >
- > (stuff deleted)
- >
- >Good SA depends more on the quantity of information gathered, which comes
- >almost exclusively from the 5 degreee locus around the point of focus, with
- >almost none of it coming from the region that is normally called 'peripheral
- >vision'.
- >
- >Since it is very difficult to focus on a point very far from the center of
- >the field of view (in front of the head: try to focus on something in the
- >'peripheral vision' region) this part of your vision is not as important as
- >one simple concept: scan. Moving the focus of vision is the primary method
- >for gathering information on the environment, and if you rely on peripheral
- >vision to warn you of danger then you are not scanning your environment
- >enough.
- >
-
- This is easily explained. I seem to remember that the retina has only a very
- small area that contains sufficient receptors to provide a focused image.
- You cannot actually focus outside that narrow area, but the brain normally
- compensates for this effectively. I think that 5 degress may be just right.
-
- >You did not even mention one of the major benefits of helmets: protection from
- >flying dust particles (yes, on my fully faired Wing it is a problem) or just
- >the wind itself. On any bike, there is enough turbulence even in a relatively
- >calm pocket to cause reduction of visual acuity when you do not wear goggles
- >or a full face helmet.
- >
-
- I have tried riding without a helmet, but the air pressure makes my eyes
- water at speeds over 25/30mph so it's a no-go.
-
-
-
- --
-
- Roland Besserer
- QUAD Systems
- roland@quadsys.com
-