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Before surgery, you'll meet with a coordinator to evaluate the condition of your eyes and to take a number of measurements, including corneal thickness, corneal mapping, refraction, air pressure and the dilation of your pupils. These measurements allow your surgeon to go away and make their own measurements for using the laser during your surgery.
If you wear rigid gas permeable contact lenses, these need to be removed for at least three weeks prior to the evaluation. Any other type of contact lenses should not be worn for at least three days prior to the evaluation. Take your glasses to the evaluation so that your doctor can review your prescription.
Your face should be clean and makeup free before both the evaluation and the surgery and your hair should be flat, without any accessories, so that your head can be put into the right position underneath the laser. You should also eat a light meal before your surgery and take any prescribed medications.