The individual data on visual acuity and accommodation range were compared before and after training of accommodation
under control of convergence in patients with myopia (N = 33) and hypermetropia (N = 31). The training course consisted
of 10 sessions of exercises, during which the patients were instructed to recognize visual stimuli of different sizes,
presented at different distances from the eyes. During the session, we gradually changed the strength of corrective
lenses under the correct control of convergence of the eye axes on the screen with the visual stimulus. The effect of
training was assessed at the three observation distances: 0.5, 1.0 and 5.0 m. The majority of patients with both myopic
and hypermetropic refraction had the highest positive effect at the viewing distance of 1 m. However, the individual
data differed significantly. The results of the training depended on the initial level of visual acuity, accommodation
range, the degree of ametropia and the presence of astigmatism. The most significant improvement of visual acuity was
observed in patients with slight degree of ametropia without astigmatism. The improvement of visual acuity was usually
combined with the improvement in accommodative ability.
accommodation, visual acuity, myopia, hypermetropia, convergence, functional correction
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