An auto refractometer inoshandiswa kutarisa kuchinjika kwechiedza mushure mekupinda muziso reziso.Inoshandisa mamiriro eemmetropia sechiyero chekuyera chiyero chemutsauko muvergence uye kupararira pakati peziso rakaongororwa uye emmetropia.Zvimwe zvedu auto refractometer ine keratometer, keratometer inoshandisa inovhenekera zvimiro zve cornea kuyera radius yeku curvature ye cornea.