Predicting prescribed magnification

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
James S Wolffsohn, Frank Eperjesi

Abstract

To determine the best method of estimating the optimum magnification needed by visually impaired patients. The magnification of low vision aids prescribed to 187 presbyopic visually impaired patients for reading newspapers or books was compared with logMAR distance and near acuity (at 25 cm) and magnification predicted by +4 D step near additions. Distance letter (r = 0.58) and near word visual acuity (r = 0.67) were strongly correlated to the prescribed magnification as were predictive formulae based on these measures. Prediction using the effect of proximal magnification resulted in a similar correlation (r = 0.67) and prediction was poorer in those who did not benefit from proximal magnification. The difference between prescribed and predicted magnification was found to be unrelated to the condition causing visual impairment (F = 2.57, p = 0.08), the central visual field status (F = 0.57, p = 0.57) and patient psychology (F = 0.44, p = 0.51), but was higher in those prescribed stand magnifiers than high near additions (F = 5.99, p < 0.01). The magnification necessary to perform normal visual tasks can be predicted in the majority of cases using visual acuity measures, although measuring the effect of proximal magnification d...Continue Reading

References

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Citations

Feb 8, 2006·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Andrew R WhathamAvinoam B Safran
Mar 1, 2012·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·James S WolffsohnFrank Eperjesi
Oct 5, 2010·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Daryl R Tabrett, Keziah Latham
Aug 21, 2019·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Andrew Carkeet
Jul 31, 2012·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Balsam Alabdulkader, Susan Leat

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