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G. Dai; Optical Surface Optimization for the Correction of Presbyopia . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2631.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To optimize an optical surface for the correction of presbyopia through refractive surgery, contact lenses, or intra-ocular lenses (IOL). Methods: The optical quality represented by the modulation transfer function (MTF) of human ocular aberrations was used as the parameter to optimize each given vergence power. For emmetropic presbyopes, a circularly symmetrical, pupil-size dependent surface for near-add was assumed. The surface was then expanded to polynomials up to the 6th order. To maximize the optical quality, an iterative, multi-dimensional, non-linear optimization was employed, which estimated the best surface based on pupil size, residual accommodation, and vergence power requirement. For presbyopes with refractive error, the optimal surface was combined with surface to correct the refractive error. Results: Using the optimization procedure, the polynomial expansion of the optical surface up to the 6th order produced a surface that was practical as well as optimal. The multi-dimensional and non-linear nature of the problem suggests that a unique solution cannot be attained after the optimization. Other constraints are still needed to discriminate among the possible solutions for specific applications. Conclusions: The novel approach proposed in this presentation can be used to determine optimal optical surfaces for presbyopia correction.
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