Abstract: Objective To investigate the corneal diopter correction in air crews on active service for the assessment of their vision and adaptability to flight. Methods Air crews on active service from an aerospace medical identification and training center of air force underwent slit-lamp examination, corneal curvature and direct ophthalmoscopy, respectively. Those with indications for corneal diopter correction or with their corneal K value ＜ 40 or with abnormal corneal image underwent topography, during which their positive or suspected positive parameters were recorded. Results Of the 2 386 air crews on active service, 59 with 116 eyes(2.47%) aged 23-43 years (mean 28.53 years) received corneal diopter correction. Of these 59 air crews, 5 (8.47%) were pilots, 27 (45.76%) were engineers, 1 (1.96%) was a nevigater, 12 (20.34%) were correspondents and aimers, 12 (24.07%) were combat service supporters. Of these 59 air crews, 24 with 47 eyes (39.66%) underwent LASIK, 9 with 18 eyes (15.52%) underwent PRK, 23 with 46 eyes (55.18%) underwent PRK, 1 with 2 eyes (1.72%) underwent LASEK, and 2 with 3 eyes (2.59%) underwent RK. The operation time was 3 months -16 years (mean 7.59 years). The distant vision was 0.5 -1.5 after operation with 97 eyes ≥ 1.0 (83.62%), 19 eyes ＜ 1.0(16.38%). The average intraocular pressure (IOP) was 13.50 mmHg, the average corneal K-value was 39.39 in right eyes and 39.83 in the left eyes, the average corneal thickness was 498.16 μm in the right eyes and 506.20 μm in the left eyes. Postoperative complications such as dry eye syndrome and asthenopia occurred in 13.56% of the air crews. Conclusion The distant vision is rather good in 83.62% of the air crews, dry eye syndrome and asthenopia are found in 13.56% of air crews after corneal diopter correction. Their vision and adaptability to flight should be further assessed.