Advantages of the keratometer in refraction.
D001251:Astigmatism / Q000175:diagnosis*; D005123:Eye; D006801:Humans; D013508:Ophthalmologic Surgical Procedures; D009907:Optometry / Q000295:instrumentation*; D012029:Refraction, Ocular; D014787:Vision Tests
ASTIGMATISM/diagnosis; OPTOMETRY/apparatus and instruments; REFRACTION, OCULAR