• In a study of 56 patients, the old glasses of a previously refracted individual were as close to the final subjective refraction as the reading obtained with a 6600 Autorefractor. Therefore, the previous spectacle correction might logically be used for the starting point of a subjective refraction, with retinoscopy or automatic refractor results being used for this purpose in patients whose previous spectacle refraction is unknown or in the first refraction of an aphakic patients.
Pappas CJ, Anderson DR, Briese FW. Is the Autorefractor Reading Closest to Manifest Refraction?A Comparison of the Patient's Previous Spectacles and the 6600 Autorefractor Reading. Arch Ophthalmol. 1978;96(6):997-998. doi:10.1001/archopht.1978.03910050521002