A relationship between visual acuity (VA) and condition of the eye optic system was investigated. The results of
uncorrected VA measurements as well as spherical and cylindric refraction components were selected in people with the
age ranging from 11 to 60 in whom VA reduction could be caused specifically by refraction anomalies – in all 571 cases
(eyes). In addition the same measurements were used in 56 ophthalmically healthy people (112 eyes). It was shown that in
the space of theoretically permissible combinations of spherical and cylindric components there are areas of their most
likely, unlikely and practically not possible combinations. In different regions of this space VA depenedence upon the
combinations of spherical and cylindric refraction components is exhibited in a certain specific way and, on the whole,
it may be described as a surface of a very complicated shape. When distinguishing only a spherical component or only a
cylindric one this dependence is most adequately described by nonlinear functions. The degree and sign of the linear VA
correlation with these refraction components change on different axis segments of their variation and especially they
radically change with a spherical refraction component.
visual acuity, refraction, myopia, hypermetropia, astigmatism
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