Be patient, it is not unusual to have an initial overcorrection with a high prescription. It may regress over the next couple of months. We generally wait 6-12 months before deciding on an enhancement to insure a stable prescription.
It is most common that one eye heals faster than the other in PRK. It is unusual for them to both heal at exactly the same pace. The frequent use of artificial tears will speed up the healing process and it is important to avoid rubbing of th eyes which can cause the new surface...