From earth to the moon.
Benvenuti
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D055580:Astronomical Phenomena; D001256:Astronomy; D003198:Computer Simulation; D003315:Cornea / Q000601:surgery*; D006801:Humans; D054018:Lasers, Excimer; D007910:Lenses, Intraocular; D018903:Photorefractive Keratectomy; D054140:Refractive Surgical Procedures