Comparison of Near Add by Raf Rule and Age-Based Addition Method

Abstract

Purpose: Use of plus lenses compensate for the reduction in amplitude range caused due to presbyopia. It brings the near point of accommodation of presbyopia patient to a distance which is suitable for performing near tasks. The basic aim of this study was to compare two different methods of prescribing near add in presbyopia patients. The research was carried out with 40 subjects with mean age 61.0(range 40-70 years). Two different methods were used to determine near add, including the amplitude of accommodation by RAF ruler and age based plus lenses method. The add power obtained by both procedures was then refined to reach the final prescription. The results obtained by both procedures showed a notable difference in near addition values. The mean near add values in case of age based method were higher as compared to those with AA by RAF rule method. Age-based method overestimated reading addition relative to other method. Mean near addition obtained by RAF rule method and age-based method were 0.86 and 1.51, respectively. The results were highly significant with p value of (p=0.000).