Satoshi13
though ICAO manual does not speak of correction of keratoconus, JAR manual categorically says that during the early stages, keratoconus may be treated with spectacles, and later with contact lenses. The surgery is the final resort.
However, before undergoing surgery (when you may have relief either with spectacles or Contact Lens), please contact your Aviation Medical Examiner or the Malaysian Civil Aviation Authority to seek clarifications.
IMHO, if spectacles/Contact Lens assure you aviation fitness, why undergo surgery?