From: "Michael Abramoff" <abramoff@capitolonline.nl>
To: "Color and Vision Network" <cvnet@lawton.ewind.com>
Subject: Re: CVNet - query on stress and the visual system
I am not a neuro-ophthalmological specialist, but it seems highly improbable
to me that tunnel vision is caused by ischemia in the retina. What I have
learned is that tunnel vision is related to perceptual narrowing, a cortical
process. Anyway, tunnel vision occurs in some individuals during acute or
chronic stress, but not in others.
I could find only one reference by H Breedlove, an optometrist, in 1993
Clinic Optometry (in Medline). Since reliably measuring retinal bloodflow
and ischemia is quite a scientific challenge to ophthalmologists right now,
I wonder how he performed these studies during stress in the first place.
I am very curious what other CV'ers have to say about this.
By the way, I am at home with a broken leg, so I symphatize with your PS.
Michael Abramoff, MD (Opthalmologist), MSc
University Hospital Utrecht, Dept. Ophthalmology / Image Sciences Institute,
Utrecht
University Hospital Vrije Universiteit, Dept. Ophthalmology, Amsterdam
Netherlands
> PS - last year, I asked about the effect of blue light for lighting
military
> vehicles
> in low light situations. I never posted the responses I received as I
> decided to
> spend the summer breaking my arm and ribs. Thanks for the replies. The
gist
> of the discussion was that blue light was used for the problem as red
light
> was
> found to be aesthetical unpleasing and interferred with map and display
> reading.
>
> It certainly wasn't because of enhancement of scotopic vision. That claim
> just wandering
> into the pop disucssion from parts unknown. The problem is still a
problem
> as people don't
> like red light and blue is not optimal at all for night vision but good
for
> some maps.
>
>
>
>
This archive was generated by hypermail 2b29 : Mon Jul 10 2000 - 09:50:37 PDT