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Accommodation stimulus and response determinations with autorefractors
Author(s) -
Atchison David A.,
Varnas Saulius R.
Publication year - 2017
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/opo.12340
Subject(s) - accommodation , autorefractor , stimulus (psychology) , mathematics , optics , optometry , computer science , psychology , refractive error , physics , cognitive psychology , medicine , visual acuity
Purpose To develop equations for accommodation stimulus and accommodation response with autorefractors when the accommodation stimulus is produced by combinations of object distances and lenses placed in front of eyes, and to give worked examples using these equations. Methods Simple ray tracing was used to determine stimulus and response equations, taking into account the reference positions for targets, for refraction, and for autorefractor readings. Results Several examples applying equations are provided. Features of these examples include evaluating approximate calculations that have been used previously, demonstrating which equations should be used in different circumstances, how to substitute numbers into equations, how to deal with discrepancies between subjective and objective refraction, and how to deal with astigmatism. Problems associated with measuring accommodation response by placing lenses in front of the eye are discussed. Conclusions Accurate equations for accommodation stimulus and accommodation response for a range of accommodation stimuli in different setups have been developed.