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been no reports on PRK stability during long-duration space flight (LDSF) and no reports of LASIK use during any length of spaceflight. This correspondence suggests that both PRK and LASIK are safe and effective procedures that provide stable vision during launch, 6 mo of continuous spaceflight, and descent, with no visual changes attributable to these procedures. CASE REPORTS Astronaut 1, a 44-yr-old white man, had bilateral PRK for myopia in 2009 without complications. His preoperative cycloplegic refractive errors were −4.25 − 0.25 × 90 OD and −4.50 − 0