Radial keratotomy in the United States. Where are we six years later?
D005544:Forecasting; D006801:Humans; D007646:Keratotomy, Radial / Q000009:adverse effects / Q000592:standards*; D008962:Models, Theoretical; D012029:Refraction, Ocular; D014481:United States; D014786:Vision Disorders / Q000209:etiology; D014792:Visual Acuity