Original Research

Target refractions in bilateral monofocal pseudophakia: analysis of a mathematical model

William Frith Harris, Finn Kristian Næser, Jesper Østergaard Hjortdal
African Vision and Eye Health | South African Optometrist: Vol 72, No 3 | a283 | DOI: https://doi.org/10.4102/aveh.v72i3.283 | © 2013 William Frith Harris, Finn Kristian Næser, Jesper Østergaard Hjortdal | This work is licensed under CC Attribution 4.0
Submitted: 07 January 2013 | Published: 07 January 2013

About the author(s)

William Frith Harris, Department of Optometry, University of Johannesburg, South Africa
Finn Kristian Næser, Department of Ophthalmology, Randers Regional Hospital, Denmark
Jesper Østergaard Hjortdal, Department of Ophthalmology, Aarhus University Hospital, Denmark

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A recent paper proposes a model for suitable target refractions for monofocal pseudophakic monovision.  The purpose of this paper is to examine the mathematics that underpins the theory.  The expressions for the optimal target refractions presented before are shown formally to define the minimum of the mean binocular refractive error over a range of object distances.  The model is shown to be much more sensitive to errors in the distal target refraction than to errors in the proximal refraction.  It is also more sensitive to the choice of proximal limit of the object range than to the distal limit.  These considerations are important in selecting and evaluating suitable combinations of refractions in pseudophakic monovision. (S Afr Optom 2013 72(3) 103-109)


Target refraction, pseudophakia, monovision, mathematical model, astigmatism


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