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A Review of Depth of Focus in Measurement of the Amplitude of Accommodation

Institute of Optometry, 56-62 Newington Causeway, London SE1 6DS, UK
School of Health and Social Care, London South Bank University, 103 Borough Road, London SE1 0AA, UK
Department of Vision and Hearing Sciences & Vision and Eye Research Unit, Anglia Ruskin University, East Road, Cambridge CB1 1PT, UK
Centre for Applied Vision Research, Division of Optometry and Visual Science, City, University of London, Northampton Square, London EC1V 0HB, UK
Author to whom correspondence should be addressed.
Vision 2018, 2(3), 37;
Received: 12 July 2018 / Revised: 24 August 2018 / Accepted: 31 August 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Physiological Optics of Accommodation and Presbyopia)
The aim of this review is to investigate the role of depth of focus (DoF) as a potential confounding variable in the measurement of the amplitude of accommodation (AoA). The role of DoF in human vision is briefly summarised, and it is noted that the prevalent method of measuring AoA is the push-up method. Factors influencing the effect of DoF on the push-up and other methods of measuring AoA are reviewed in detail. DoF is shown to add substantial measurement error in the routine assessment of accommodation when the AoA is measured by methods involving subjective judgement of an object’s clarity. Reliable compensation for this source of error is not realistically possible because of the complexity of the aetiology of DoF, and its inter-individual and intra-individual variation. The method of measurement also influences the extent of the error. It is concluded that methods of measurement of AoA that exclude DoF should be preferred. View Full-Text
Keywords: amplitude of accommodation; depth of focus; measurement error; optometry amplitude of accommodation; depth of focus; measurement error; optometry
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Burns, D.H.; Allen, P.M.; Edgar, D.F.; Evans, B.J.W. A Review of Depth of Focus in Measurement of the Amplitude of Accommodation. Vision 2018, 2, 37.

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