Calculating the error in refractive error

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Abstract

Aims and Purpose: To demonstrate a quick way of calculating the optical difference between two refractions using vector analysis, and to express this as a score for examination purposes. Methods: An existing formula is applied, converted to a defocus equivalent, and then converted to a score. The formula is set out in an Excel spreadsheet. Results: The spreadsheet enabled rapid assessment of the difference between two refractive errors. Examples are demonstrated. Conclusion: The spreadsheet was successful in enabling a comparison of any two refractions, expressing the difference either as a correcting (third) refraction, a defocus equivalent or a one-figure score. © 2011 Macmillan Publishers Limited All rights reserved.

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Taylor, R. H., Ellingham, R. B., Subramaniam, S., & Wakely, L. A. (2011). Calculating the error in refractive error. Eye, 25(10), 1333–1336. https://doi.org/10.1038/eye.2011.169

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