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Comparison of Subjective with Objective Measure of Amplitude of Accommodation with Age Matched Hofstteter?s Normative Data

Gomathy Boobathy

Aim: To analyze the comparison of subjective with objective measure of amplitude of accommodation with age matched hofstetter’s formula.

Purpose: Dynamic retinoscopy is an objective technique for assessing maximum accommodative responsivity. The present study examined the reliability of this procedure when measuring the amplitude of accommodation.

Methods: The amplitude of accommodation was measured in 57 subjects between 17 and 22 years of age using Dynamic Retinoscopy and a subjective method, Modified Pull Away. The repeatability between the methods were determined using the mean difference.

Results: Dynamic Retinoscopy showed the lowest mean value of Amplitude of Accommodation (average=7.71 D) whereas the mean value for Modified Pull Away was 9.80 D. Average for Dynamic Retinoscopy-Modified Pull Away was 2.10 D.

Conclusion: The Dynamic Retinoscopy technique provides a more veridical measurement of the Amplitude of Accommodation because it avoids the over-estimation resulting from the depth-of-field. Moreover, the Dynamic Retinoscopy technique exhibited higher reproducibility when compared with subjective methods.