Simplified free Hess screen test for ocular
Try this and check your eyes!
It is a free Lancaster test, it is actually
a simplified Hess screen. It really works on your PC, you could also
use a video projector to achieve better results. It is an ideal
device for measurement and documentation of all comitant and
incomitant deviations in 9 cardinal gaze positions i.e. an standard
deviometry chart could be derived easily. It is useful in evaluating
patients with paretic or paralytic strabismus who have normal
and install the program. Simply follow the instructions.
2. First of all you need two optical
filters, a pure Red and a pure
Green filter. Check the purity of the filters by placing them over
each other, you should see nothing with the combination resultant black filter.
3. Set your PC security setting allowing the
Java scripts to run.
4. You should be familiar with the basics of
strabismus and retinal correspondence and dissimilar target tests.
5. Wear red-green goggles and click the link
below to lunch the program. place circles over each other using the
mouse and write down the result, click anywhere to continue to the
next gaze position.
6. Reverse the red and green filters and
repeat the test.
7. Close the test just touching the mouse in
the first page left and down. Do not click!
this page, in any manner, you agree that you have read &
understood the following.
This software is developed by Dr. Alireza Peyman. The
material is intended only for the educational and personal use
of health care students and professionals. It is not intended for
persons who have not received appropriate medical training, and
should not be used for making clinical decisions pertaining to
patient diagnosis, care, or management. No warranties, implicit or
otherwise, are being made as to the accuracy and completeness of the
The software at this web site may be freely downloaded and
used for non-commercial purposes. Due acknowledgement is required if
results using the software are published in any form. Any commercial
use or re-distribution requires prior written consent from Dr.
Please contact me if you encounter any problem or there
was any inconvenience using this