|
LASIK Up-to-date Newsletter
FreeVis Simulator for twilight and night vision after LASIK
or PRK / LASEK
LASIK is perfectly suited to correct low or average myopia, and low
hyperopia. Even at dusk or night, visual acuity remains as before LASIK.
However, LASIK has limits depending on the rate of nearsightedness and/or
farsightedness, and the diameter of the pupil. It is possible that with
severe nearsightedness and/or farsightedness, and a very wide pupil,
halos may occur during dusk and at night, which, under certain circumstances,
might decrease visual acuity.
A halo is created due the incorrect ratio between the size of the cornea
zone that was “smoothed” with the Excimer Laser, and the
diameter of the pupil at night. If the pupil becomes larger than the
“smoothed” cornea zone, a halo occurs because one part of
the light entering the eye is displayed as a blur.
FreeVis would like to demonstrate the causes are for this, and how
they influence visual acuity. We are providing a simulator that illustrates
visual acuity, depending on your visual disorder, and the pupil diameter
in the dark.
The illustrated traffic situation contains all typical light sources
in street traffic: brake lights, traffic lights and headlights of approaching
vehicles. Each simulated picture shows the contrast of the same traffic
situation from a person with normal vision, from a person with ametropia
without glasses / contact lenses, as well as after LASIK . This gives
a general picture of the extent of the possible glare.
Start
the FreeVis simulator here!
|