when one reads that in VEP a checkboard is shown as positive/negative image
at a 4Hz rate, it is ambiguous. Which of the following two loops is right?
a) show positive, wait 250ms, show negative, wait 250ms, again..
b) show positive, wait 125ms, show negative, wait 125ms, again..

Daily from around the world We have read a news on the internet, news
paper or magazine about medical profession made some wrong treatment
or intervention to the patient.
Whether it is causes dead cases or injury to the patient.

average vision in the other (-2). I often wear contacts but when not wearing
them I try to avoid wearing glasses except for driving, tv etc. As a result I
often get strain in the poor eye - is this as a ...

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Harris.txt
Dear Second-opinion friends,
Subject:  Paul Harris spells this preventive second-opinion
on Robert Hohendorf's web site

I love my vision with my RGP contacts, but in low light I'm getting
starbursts around point sources of light.  It has to be quite dark,
like driving on a country road at night - then lights in the distance
turn into annoyingly large asterisks.  An oncoming car or even a nearby

I have a small amount of astigmatism (-0.25) in one eye which I understand is
very small. I wear contacts so given that -0.25 small I was surprised that I
noticed the difference between my eyes when I was test with lenses in. I
could read 20/15 with the better eye and only just ...

I have disposable (soft) toric contact lenses that are supposed to be
worn for 14 days and then replaced. The lenses are for distance
vision, and because I work out of my home at a computer, I don't put
them in when I'm here. I generally only wear them when I go out for,

Dear Second-opinion friends,
Here an optometrist, Dr. Robert Hohendorf describes
why intelligent use of the plus is needed
to clear your refractive STATE back to normal.

I can tell that my eyes have got more myopic since my last
prescription. So until I get a new prescription I think it's a bit
like having a slight plus lens on (probably about 0.5D). However, my
eyes are feeling increasingly strained when using the computer

Dear Prevention-minded friends,
Subject:  Why "weak" bifocal studies FAIL.
I have been asked to "explain" why some of
these bifocal studies fail.  Rather than I explain

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My job currently reqires full time computer use, so I am viewing a computer
8+ hours a day.  I have been experimenting with plus lenses +1.25D lenses
for a few months now when I use my computer.    Without any lenses my vision
is good,  I see typically 20/15 distance vision and ...

About 6 years ago I began to notice that from one day to the next the clarity
of my vision shifted.
Some days crystal clear. Other days, I might as well have not bothered
putting glasses on.

how would you ensure the maximum cortical (visual, primary) stimulation
from a video?
I thought about a black and white chequered board inverting (the black
and white) at a rate of about 7 Hz.