USER MANUAL (Instruction for Use) SW 6.1
Introduction
Version 6.1.6 dated 2020-01-31 EN Page 44 of 201
3.3.3 Direct Side Effects (caused by the laser surgery)
Infection and Delayed Healing:
There is about a 0.1 percent chance of the cornea becoming infected after
PRK/TransPRK, and a somewhat smaller chance after LASIK. Generally, this means
added discomfort and delay in healing, with no long-term effects within a period of
four years.
Undercorrection / Overcorrection:
It is not possible to perfectly predict how the eye will respond to laser surgery. As a
result, the patient may still need corrective lenses after the procedure to obtain good
vision. In some cases, a second procedure can be performed to improve the result.
Decrease in Best-Corrected Vision:
After refractive surgery, some patients find that their best obtainable vision with
corrective lenses is worse than it was before the surgery. This can occur as a result of
irregular tissue removal or the development of corneal haze.
Excessive Corneal Haze:
Corneal haze occurs as a part of the normal healing process after surface ablations
like PRK and TransPRK. In most cases, it has little or no effect on the final vision and
can only be seen by the doctor through a microscope. However, there are some cases
of excessive haze that interferes with vision. As with undercorrections, this can often
be dealt with by means of an additional laser treatment. The risk of significant haze is
much lower with LASIK than with PRK.
Regression:
In some patients the effect of refractive surgery is gradually lost over several months.
This is similar to an under correction, and re-treatment is often possible.
Halo Effect:
The halo effect is an optical effect that is noticed in dim light. As the pupil enlarges,
the untreated peripheral cornea produces a second faded image. For some patients
who have undergone PRK/TransPRK or LASIK, this effect can interfere with night
driving.
Incomplete Procedure:
Equipment malfunction may require the procedure to be stopped before completion.
This is a more significant factor in LASIK, with its higher degree of complexity, than
in PRK or TranPRK.
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