Abstract: Objective To observe the effect of fitting rigid gas permeable lenses(RGP) correcting ametropia of keratoconus.Methods 25 patients(43 eyes) with keratoconus fitted RGP,and patinets' visual acuity(VA),cornea condition,degree of comfort and complications were observed.Results All of 43 eyes were successfully to fit RGP at the first time with mean diopter-8.99±-5.55 DS,corrected vision of RGP was significantly better than(or equal to) spherical-cylindrical lens,and get better corrected vision and fewer and more mild complications.Conclusion RGP can get a better correcting vision to keratoconus than spherical-cylindrical lens,and is the good nonoperative treatment to correct ametropia of keratoconus.

Key words: rigid gas permeable lenses, keratoconus, vision