Automatic infrared refractors: a comparative study

摘要: In order to determine the performance of seven automatic infrared (IR) eye refractors, measurements have been conducted on a model as well normal subjects and patients under standardized conditions. Concerning eye, range measurement slightly smaller than specified linearity errors detected several instruments. Using group 55 ametropic subjects, results refraction were compared conventional subjective examination. The spherical equivalent differed by less 0.51 D in more 80% all cases error cylinder power was 90% cases. Larger found with intra ocular lenses, aphakic eyes, or scattering media. each these groups at times either impossible yielded wrong result.