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Photorefractive Keratectomy and Laser-Assisted In Situ Keratomileusis on 6-Month Space Missions
Aerospace Medicine and Human Performance
|May 8, 2024
Summary
Vision remained stable for astronauts who underwent photorefractive keratectomy (PRK) and laser-assisted in situ keratomileusis (LASIK) during long-duration space missions. Both refractive surgery procedures were well-tolerated in microgravity.
Area of Science:
- Ophthalmology
- Aerospace Medicine
- Refractive Surgery
Background:
- Photorefractive keratectomy (PRK) and laser-assisted in situ keratomileusis (LASIK) are common refractive surgeries.
- Long-duration spaceflight presents unique physiological challenges.
- The stability of these procedures in astronauts is crucial for mission success.
Purpose of the Study:
- To document the stability of PRK and LASIK in astronauts during 6-month International Space Station missions.
- To assess the tolerance of these refractive surgeries in microgravity.
- To evaluate visual function throughout spaceflight.
Main Methods:
- Comprehensive ocular examinations were performed before and after space missions.
- In-flight visual acuity testing was conducted at specified intervals.
- Astronauts were surveyed for subjective visual changes during flight.
Main Results:
- Stable vision was documented in both PRK and LASIK astronauts.
- Visual function remained consistent during all phases of spaceflight, including launch, microgravity, and landing.
- No significant adverse events related to the refractive surgery were reported.
Conclusions:
- PRK and LASIK appear to be stable and well-tolerated procedures for astronauts.
- Refractive surgery does not compromise visual function during long-duration spaceflight.
- These findings support the use of PRK and LASIK for astronauts undertaking extended missions.
