Observational research identifies a lack of consistent change in convergence with night myopia, suggesting variability in underlying mechanisms.
Accommodation and convergence normally bear a tight relation to each other. To the extent that night myopia is due to an actual change in lens convexity, accommodation in night myopia should be accompanied by a commensurate change in convergence. This prediction was shown to be false because of variability in the convergence mechanism.
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BOHMAN et al. (1980) studied this question.
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