Abstract

Experiments are reported showing that a variety of clues such as chromatic aberration, spherical aberration, or astigmatism may be used to decide whether a monocularly viewed out-of-focus target requires an increase or decrease of accommodation for it to be refocused. When these clues are removed the initial direction of accommodation readjustment may be in error.

© 1959 Optical Society of America

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References

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  1. E. F. Fincham, Brit. J. Ophthalmol,  35, 381 (1951).
    [Crossref]
  2. F. W. Campbell and J. G. Robson, J. Opt. Soc. Am. 49, 268 (1959).
    [Crossref] [PubMed]
  3. See G. Westheimer, J. Opt. Soc. Am. 47, 714 (1957), for a description of the double stimulating beam.
    [Crossref] [PubMed]

1959 (1)

1957 (1)

1951 (1)

E. F. Fincham, Brit. J. Ophthalmol,  35, 381 (1951).
[Crossref]

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Figures (4)

F. 1
F. 1

Records of hand-actuated focus adjustments to a visual focusing task. Upper portion of each record is the hand response and lower record is a dioptric displacement of the visual target. (a) Response in white light. (b) Response in monochromatic light without training. (c) Response in monochromatic light 30 responses after the beginning of record (b).

F. 2
F. 2

Records of hand-actuated focus adjustments to a visual focusing task. Upper portion of each record is the hand response and lower record is the dioptric displacement of the visual target. (a) Response in white light with full pupil. (b) Response in monochromatic light with annular pupil.

F. 3
F. 3

Response to a visual focusing task when the subject’s control consisted of a reversing key which altered the direction of motion of a target moving with constant speed.

F. 4
F. 4

Record of accommodation obtained with a high-resolution optometer when a small high contrast target is displaced from optical infinity to 1 diopter beyond infinity and back. This figure demonstrates the type of false response that is occasionally obtained.