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Analysis of methods for predicting near-magnification power
1Low Vision Clinic Southern College of Optometry, Memphis, TN 38104, USA.
Background:
Data were analyzed from 25 consecutive patient visits to the Low Vision Rehabilitation Service at Southern College of Optometry, during which magnification for near was recommended.
Methods:
Linear regressions with analysis of variances were calculated for the results obtained from four near-different near-magnification prediction-calculation methods to determine how accurately they predicted the final near recommended magnifications. A t-test was performed to look for mean differences between calculation methods.
Results:
No significance was found between the means of three of the calculation methods; a significant difference was found for one. However, all four near-magnification calculation methods significantly predicted final near magnification.
Conclusions:
Low-vision rehabilitation clinicians may feel comfortable using any of the four near-magnification methods Choice of method may be a reflection of previous method usage by the clinician. Use of the Lighthouse Near Acuity Test Chart reduces the need to calculate the near-magnification power with which to begin near-magnification testing.