Dear Hoover,
I would be grateful if the following could be posted out over CVnet.
Quite a large number of people have asked me what I found out from the query
I recently sent out over CVnet. I have compiled the responses and included
a list of those refering to different systems here.
The original request:-
We are looking for some software for use on IBM compatible PC's which allows
both routine testing of vision for things such as visual acuity, contrast
sensitivity, colour etc. but which is also flexible enough to be used for
research purposes. One such system we have details on is the UMIST eye
system. However, this system lacks a really accurate measure of contrast
sensitivity (no sine-wave gratings etc.). We would be grateful for details
of any similar systems.
The responses:-
Cambridge Research Systems produce a graphics board (VSG 3) and associated
software that provides a wide range of tests for visual psychophysics and
also libraries of routines in C or PAscal that allow users to develop ther
own programs. Very powerful, but becoming widely used. They are based in
Rochester, Kent tel 01 643 20 719
Ian Holliday
We did some research comparing various types of vision screeners, 2 of which
were on pc, they were the 'vutest' made by keeler ltd and the 'city
university vision screening system', neither test contrast sensitivity and
only do standard things like acuity, muscle balance etc. They are possibly
not what you are looking for, but if you want any further info get in touch.
Mark Mugglestone
Paul
I use a system developed at the University of Oslo called Vigra C. The
system is yet a prototype, but can be used in the clinic. We use the system
for both contrast sensitivity and VEPs. The system is based on a video
hardware developed for an IBM PC.
Spec:
- 10 bit colordepth in all tree channels (RGB)
- 10 bit luminance depth
- 100 Hz vertical refresh rate
- Colour coding: CIE 1931 x,y,Y
- sinus and square modulated horizontal and vertical patterns
- sinus and square modulation in space and time
Please let me know if this sounds interesting.
Sincerely,
Lars Rune Bj|rnevik
Huseby National Recouce Center, Oslo, Norway
I have been using some software from Neuroscientific in Farmingdale,
NY, USA (voice = 516-694-0026; fax = 516-694-1033) for contrast
sensitivity measurements. It works quite well. We bought some
hardware from them as well, but that was optional, I think. I use it
for contrast sensitivity measurements in pigeons, but we have used it
with very good success with humans as well. They make a range of
equipment for both research and clinical application in vision and
visual electrophysiology and probably have just what you need.
Good luck.
Bill Hodos
Psychology
University of Maryland, College Park
USA
The vast majority of responses I received by email referred me to the VSG
system produced by Cambridge Research Systems. In addition, to email
responses I was sent details of a motion-defined letter test and a
texture-defined letter test both developed by Regan and Hong at Dept. of
Psychology, York University, 4700 Keele Street, North York, Ontario. M3J 1P3.
I would like to thank everybody for their responses,
Paul Sowden.
Dept. of Psychology
University of Surrey
GUILDFORD
Surrey
GU2 5XH
U.K.