The “LAS” stands for “laser,” which is an acronym itself (light amplification by stimulated emission of radiation).
The “I” stands for in-situ, which is Latin for “in place.”
And the “K” is for keratomileusis, a Greek word that means cornea-shaping (lit. horn-carving).
So you have an acronym made up of another acronym, a Latin phrase and a Greek compound word. Yeesh!