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Yannick Nochez, Guillaume VanderMeer, Yohann Benard, Pierre-Jean Pisella, Richard Legras; Comparison Of Optical Quality Metrics To Predict Subjective Quality Of Vision In Multifocal Contact Lenses Wearers. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1393.
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To compare through focus subjective quality of vision and objective image quality metrics in three multifocal contact lenses wearers.
Through focus subjective assessment of the quality of vision was measured each 0,1 diopters (from -4 to +3 D) under cyclopentolate 0,5% and through a 5mm artificial pupil diameter) with the use of 5 items grading scale according to ITU-R 500 recommendations in 5 conditions (naked eye, Air Optix Multifocal High® wearer, Air Optix Multifocal Low® wearer, Proclear Multifocal Distance Addition 1D wearer and Proclear Multifocal Distance Addition 2,5D wearer). The target was three high-contrast letters of 0.4 logMar size. The subject astigmatism was compensated using an optic adaptative system (CRX1®, Imagine Eye). Eighteen through focus OTF and MTF-based image quality metrics were calculated using the wavefront of the eye wearing the contact lens.
The best correlation (r2=0,81) between objective measurements and subjective assessment was obtained with visual Sthrel Ratio based on MTF measurements between 3 and 12 cycles/degrees (VSrMTF3-12). However, none of the eighteen objective image quality metrics was able to predict the bimodal subjective curve obtained with Proclear Multifocal Distance Addition 2,5D contact lens.
The VSrMTF3-12 image quality metrics may be used to predict subjective quality of vision for naked eye and in low-addition multifocal contact lenses wearers. Nevertheless, the bimodality of some subjective curves could not be estimated with these objective quality of vision items.
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