Abstract
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)
Highlights
The aim of contemporary cataract surgery is to obtain optimal uncorrected visual acuity over the most extended fixation range
The model leads to the optimal target refractions
We examine the nature of the mean binocular error as a function of the four variables FD, FP, zD and zP and show formally that Equations 1 and 2 do represent a global minimum
Summary
The aim of contemporary cataract surgery is to obtain optimal uncorrected visual acuity over the most extended fixation range. This may be achieved by the system of monovision where one eye is targeted for distance and the other eye for near.[1, 2] Monovision has been widely used with contact lenses. It is important to establish appropriate target refractions for the far and near eye, and to analyse the impact of deviations from these targets. A simple model has recently been described by Naeser and coworkers[6] for defining suitable target refractions FD and FP for each eye following surgery for bilateral monofocal pseudophakia. The model leads to the optimal target refractions
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