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We propose in this work a model for describing visual acuity (V ) as a function of defocus and pupil diameter. Although the model is mainly based on geometrical optics, it also incorporates nongeometrical effects phenomenologically. Compared to similar visual acuity models, the proposed one considers the effect of astigmatism and the variability of best corrected V among individuals; it also takes into account the accommodation and the "tolerance to defocus," the latter through adoi:10.1117/1.jbo.21.12.125005 pmid:27973663 fatcat:bmcpa7p6drbxpafohngofupaba