Findings report temporal stability of dark focus in subjects, suggesting consistent refractive power over time.
The temporal stability of the dark focus of accommodation (the refractive power of the eye in total darkness) was examined using a laser optometer. It was found that dark focus does not vary greatly in most subjects over a period of 2–3 weeks. Intrasubject ranges varied from 0.08–2.92 D over that period, with a mean range of 1.07 D. Theoretical and practical implications of these findings are discussed.
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R. J. Miller (1978) studied this question.
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