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. 2017 Mar;65(3):223-227.
doi: 10.4103/ijo.IJO_545_16.

Accommodative amplitude using the minus lens at different near distances

Hamed Momeni-Moghaddam  1 , Jason S Ng  2 , Bruno Mario Cesana  3 , Abbas Ali Yekta  4 , Mohammad Reza Sedaghat  5
Affiliations

Accommodative amplitude using the minus lens at different near distances

Hamed Momeni-Moghaddam et al. Indian J Ophthalmol. 2017 Mar.

Abstract

Purpose: The purpose of this study was to compare the mean findings and the repeatability of the minus lens (ML) amplitude of accommodation (AA) at 33 cm and 40 cm.

Materials and methods: AA was measured from the dominant eye of 120 fully corrected subjects using the ML procedure when viewing the target at both 33 and 40 cm. Each measurement was repeated between 24 and 48 hours after the first trial.

Results: Mean AA when tested at 33 cm and 40 cm was 10.20 diopter (D) (standard deviation [SD] =1.24) and 8.85 D (SD = 1.23), respectively (P < 0.001). The limits of agreement of the measured amplitude calculated with taking into account of the replicates at 33 and 40 cm were - 0.19 (95% confidence interval [CI]: -0.34 to -0.04) and 2.53 (95% CI: 2.38 to 2.68), respectively. The repeatability of testing at the two distances 33 and 40 cm was ± 1.24 and ± 0.99, respectively. In addition, the retest reliability of measured amplitude using the intraclass correlation coefficient was 0.87 (95% CI: 0.789-0.920) at 33 cm and 0.91 (95% CI: 0.872-0.945) at 40 cm.

Conclusion: There is no agreement in the obtained amplitude at the two measurement distances. Testing the ML AA at 40 cm may be superior given that a lower repeatability coefficient was observed. However, it is unclear whether the larger amplitude measured at 33 cm reflects a larger increase in accommodation (greater proximity effect) or a decrease in the ability to perceive the first slight sustained blur.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Bland–Altman plot showing the difference between the measurements of amplitude of accommodation at the two test distances as a function of the mean finding (n = 240, two measurements for each subjects). The mean difference is shown by the solid horizontal line, while the 95% limits of agreement are indicated by the dashed horizontal lines
See this image and copyright information in PMC

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