February 1980
Volume 19, Issue 2
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Articles  |   February 1980
Stability of measures of the dark focus of accomodation.
Investigative Ophthalmology & Visual Science February 1980, Vol.19, 217-221. doi:
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      D H Mershon, T L Amerson; Stability of measures of the dark focus of accomodation.. Invest. Ophthalmol. Vis. Sci. 1980;19(2):217-221.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Without visual stimulation, the eye tends to assume an individually-determined intermediate state of accommodation (the "dark focus"). The present study examined the stability of these individual dark focus values over time. Two sets of measurements were obtained with a laser-Badal optometer for each of 39 college-age subjects. For 19 subjects the second test occurred during the same experimental session as the first; for 20 subjects the retest was conducted in a separate session 1 week later. Eye dominance was determined by a pointing task. High correlations between test-retest values were found for both immediate and delayed retest. The average change between the tests was less than +/- 0.3 diopter, even when the retest was a week later. These results indicate a definite stability in individual dark focus values. Eye dominance and subject's sex were both irrelevant.

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