Lasik Eyes Surgery - Vision simulation program?

Author

Vision simulation program?

Graeme Hewson

2005-07-24, 6:52 pm

Does anyone know of a vision simulation program available for
downloading? Google shows some research papers, but I haven't found
anything I could download and run today. I'm after something that would
simulate a green LED, say, at such-and-such a distance with a particular
sphere/cylinder/axis.

Pauli Soininen

2005-07-24, 6:52 pm

Great question (I don't know the answer to that). I'm also wondering whether
companies like Bausch & Lomb, Zeiss etc. have programs that would render a
custom image using patient's wavefront information. Apparently that type of
program isn't available to the public at least. As far as I know.

In my opinion, a program like that (if done properly) would be a great
forward step in the field of refractive surgery (and vision correction in
general).

Ragnar

2005-07-25, 12:22 am

There is one I know of... but it's made by a nutcase and grossly
exaggerates the effects.

On 24 Jul 2005 18:34:32 GMT, ghewson@cix.co.REVERSE:ku (Graeme Hewson)
wrote:

>Does anyone know of a vision simulation program available for
>downloading? Google shows some research papers, but I haven't found
>anything I could download and run today. I'm after something that would
>simulate a green LED, say, at such-and-such a distance with a particular
>sphere/cylinder/axis.

Glenn - USAEyes.org

2005-07-25, 1:36 pm

Visx S4 users have the ability to create the "PreVue" lens. This is a
set of glasses that are "optimized" to provide a replication of what
vision will be like after refractive surgery.

There are some major problems with all these predicting methods. The
biggest problem is probably that surgery is not always easy to
predict. Just because a computer program or a pair of glasses
indicates a particular outcome, that does not mean that the outcome
will actually occur.

It is easy to create something that will make predictions of wonderful
vision, but that wonderful vision may not occur. Equally, it is easy
to create something that will make predictions of poor vision, but the
patient may actually get a better result than predicted.

Another problem is liability for the doctor. Plaintiff attorneys love
getting copies of the "Here is what you will get." images and compare
them to the reality of what the patient actually got. There is little
doubt about what the doctor "promised" to the patient.

Glenn Hagele
Executive Director
USAEyes.org

"Consider and Choose With Confidence"

Email to glenn dot hagele at usaeyes dot org

http://www.USAEyes.org
http://www.ComplicatedEyes.org

I am not a doctor.

Pauli Soininen

2005-07-26, 9:06 am

Yes. One has to realize that predicting the result accurately is currently
not possible and there are still unknown things about the eye's behavior and
it's ability to heal back to optimal, non-distorted vision. Problems that do
occur after surgery may or may not be the fault of the mathematical ablation
profile (if not, then basically it's a flap related problem or one of the
side-effects).

Anyway, my idea of having the program is not for "law suit use" or really to
predict the result (100%), but rather to find the actual relation between
accurately matching rendered image, the real image seen by the patient and
the actual aberrations in the eye. If an accurately matching result image
can be created simply by rendering an image using convolution with the
wavefront data, then that already tells a lot (and if it doesn't match, that
also should be quite informative).

Graeme Hewson

2005-07-26, 6:02 pm

I'm more interested in checking that what I see some weeks post-LASEK
corresponds to my (current) sphere/cylinder/axis measurements. There's
still some residual astigmatism (starting from a relatively high -3D),
but the aberrometer shows no significant HOAs.