Phenomenological model of visual acuity

Abstract

Abstract. 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 a phenomenological parameter. We have fitted the model to the V data provided in the works of Holladay et al. and Peters, showing the ability of this model to accurately describe the variation of V against blur and pupil diameter. We have also performed a comparison between the proposed model and others previously published in the literature. The model is mainly intended for use in the design of ophthalmic compensations, but it can also be useful in other fields such as visual ergonomics, design of visual tests, and optical instrumentation.

Theoretical performance of progressive addition lenses with poorly measured individual parameters

“…There is a relationship between the metrics and and the loss of visual acuity as shown by Raasch 20 and Blendowske. 21 A metric value of 0.25 D 22 indicates a loss of decimal visual acuity of 0.1 in the corresponding area, which would be noticed by the wearer as a degradation in optical performance.…”

“…Blendowske. 21 A metric value of 0.25 D 22 indicates a loss of decimal visual acuity of 0.1 in the corresponding area, which would be noticed by the wearer as a degradation in optical performance.…”

Theory of Iris Photonic Visual Relativity: Very Strong Proof that People with Different Eye Colours See Colours Differently

“…This is because anything they can detect as frequency or any attempts trying to observe how "A different eye colour is seeing colours'' for the sake of a proof or disproof of this theory, yet what they will be expressing or observing in terms of colours yet will in fact only reflect "how they are seeing those colours differently according to their own colour vision interpretations'' [6]. This means regardless of how much improved is or will be the Science, such an attempt will always remain invalid, unless one iris can be delivered to another person after iris removal of the person of interest so that the person receiving iris in new colour starts seeing differently.…”