Femtosecond
Femtosecond LASIK found effective for post-RK hyperopia
A femtosecond is a measure of time. Let's put this tiny measurement of time in perspective: the difference between a femtosecond and a second is the difference between a second and about 32 million years.
A femtosecond laser is now being successfully used in LASIK surgery as a means to treat secondary hyperopia resulting from previous RK surgery.
