PRK is an alternative option for those who are not suitable for LASIK, however the pre-operative eye examination is required at TRSC to find out if you will be a suitable candidate for PRK or not. The following are guidelines for preparation for the preoperative eye examination for PRK surgery at TRSC.

1. Refrain from wearing contact lenses

- Soft contact lenses: 3 days before the exam and surgery  - Rigid Gas Permeable (RGP) Hard lenses: 14 days before the exam and surgery This may sound like a great inconvenience, but there is good reason for it. Contact lenses come into direct contact with the cornea, and can temporarily change its curvature. Rigid contact lenses have more of an effect than soft contact lenses. Even after the lens has been removed from the eye, its effect can still remain for up to approximately 3 days in the case of soft lenses, and 14 days or more for rigid contact lenses. The effect on the cornea’s curvature will affect the accuracy of the preoperative measurements and the LASIK treatment. During the examination, the ophthalmologist will look at the shape of your corneas and decide whether the measurement results are interpretable. If not, then you may have to continue without the contact lenses for a few days longer and return for repeat measurements. Listed above are the minimal guidelines, however the longer you can stop wearing contact lenses, the better.

2. Arrangement for transportation
  One of the most important steps of the preoperative examination is dilation of your pupils. As a result, you will experience some blurriness in your vision. The Moreover, the following symptoms may also occur:

3. Stop certain medications 
      Please provide us with a list of medications as soon as possible before your examination so that we may let you know if you need to stop any of them. Some medications may interfere with the accuracy of measurements or complicate the surgery.

 4. Women who are pregnant or nursing
     It is not advised for women who are pregnant or trying to become pregnant to have vision correction surgery until at least 2 menstrual cycles after giving birth.  The reason for this is that the change in hormones can temporarily affect vision, and therefore any treatment performed may not be accurate. 

 5. Choosing a surgeon
The doctor who examines your eyes will also perform your surgery. Therefore if you prefer a specific doctor for the surgery, you must make an appointment with that doctor for the preliminary eye examination.

          - Please note that if the surgery day is more than 3 months after your preoperative eye examination, you will need to go through a repeat preoperative eye examination (cost 1,000 THB). This repeat of tests is essential because it assures for consistent results, in case your eyes have changed or developed any type of problems during that time gap.

6. The pre-operative eye examination will take approximately 3.5 hours.

7. Making an appointment