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THE INFLUENCE OF METHOD ON THE STABILITY OF DARK FOCUS POSITION OF ACCOMMODATION
Author(s) -
Heron G.,
Smith A. C.,
Winn B.
Publication year - 1981
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1981.tb00151.x
Subject(s) - accommodation , focus (optics) , position (finance) , stability (learning theory) , constant (computer programming) , optics , property (philosophy) , green laser , computer science , computer vision , mathematics , laser , artificial intelligence , physics , finance , machine learning , economics , programming language , philosophy , epistemology
The stability of the dark focus position of accommodation was investigated using a Badal laser optometer. A quick method (double staircase method) and a longer method (method of constant stimuli) were employed. Diurnal, daily and test – rerest data were obtained. A method of limits study was included on a limited number of observers. Method of constant stimuli and method of limits gave small but significantly higher estimates of DFP. The results confirm the conclusions of other workers that the dark focus position of accommodation is a highly stable ‘trait’‐like property of the human visual system. The most efficacious and valid method for measuring dark focus position of accommodation was found to be the double staircase method.