Post-op refraction  
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  What to do if you have a free flap and you have lost the markings on the flap?
1:  Do the treatment as if nothing had happened. Replace the flap making sure you have the epithelium on top.
2:  Mark the flap.
3:  Do an auto-refractor and insert the value into the formula at the top of this site.
4:  The amount and direction of rotation will appear.
5:  Mark the desired position behind the slit-lamp.
6:  Go back to the operation room and rotate the flap to the desired position.
7:  Recheck and repeat if necessary.