Objective Accommodation Measurements In Different Ages By Using An Autorefractometer
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Introduction: To measure accommodation amplitude (AA) at different ages by using Tonoref 3 (NIDEK CO., LTD.) and to investigate a possible correlation with pupil diameter. Material and Methods: AA was measured in both eyes of 125 subjects between 25 and 69 years of age by using Tonoref 3. Pupil diameter was also measured at the same time with AA measurement. All measurements were repeated 3 times and for test–retest reliability, the same protocol was repeated on 3 additional days as well as twice on the same day in the young adults and the average values were collected for statistical analysis. Subjects were grouped into 10-year bins, and a descriptive univariate analysis of the data performed. Results: The mean age was 37.82 years ±1.72 (SD). The mean AA was 1.6682±0.1841 (range 0.14-8.06). In order to investigate the relationship between age and AA, the age data is divided into three groups as 30 and under, 30-39, 40 and above. A significant difference was found between 30 and 40 age above groups and 30-39 and 40 age and above (p=0.000, for each). A negative correlation was found between age and AA. In addition, a weak correlation was found between pupil diameter and AA. Conclusions: The accommodative responses measured with Tonoref 3 were significantly suitable for objective measurement of accommodation with varying ages. Pupil diameter has a weak effect on the measurement of AA.