| Abstract: | ![]()
The Topcon RM6000 autorefractor was evaluated by assessing the repeatability of its results and the extent of their agreement with the findings of conventional subjective refraction. The repeatability of the autorefractor results gives an indication of their reliability. This was determined for the Topcon instrument by comparing the right eye results of 93 patients taken before and after their eye examinations. In 95 per cent of cases the test and retest results of equivalent sphere, cylinder power and cylinder axis differed by less than 0.46 DS, 0.34 DC and 14° respectively. The validity of the autorefractor results differed depending on the age of the patient. In pre-presbyopic patients, the autorefractor gave a more minus (or less plus) result compared with conventional subjective refraction in some cases. This difference could be greater than 1.00 DS. For presbyopic patients, more accurate results were obtained, with approximately 95 per cent of results for equivalent sphere and cylinder being within ±0.50 D. |
