Abstract
Purpose
To assess how the monocular steady-state accommodative stimulus-response curve is modified when viewing low-pass filtered natural images.
Methods
Eighteen adult subjects participated in the study. The accommodative stimulus-response curve was objectively assessed by means of a Hartmann-Shack wavefront sensor. Measurements were taken at different accommodative demands. Target images were low-pass filtered versions of a natural image that were obtained applying different digital spatial filters that limited the spatial frequency content of the natural image. Cutoff spatial frequencies were set at 30, 21, and 15 cycles per degree (cy/deg).
Results
Mean data obtained for each target were fitted to linear models. For the low-pass filtered natural image with a cutoff spatial frequency at 30 cy/deg, the slope for the averaged stimulus-response curve was 0.614, while the slopes obtained for the other two low-pass filtered images corresponding to cutoff frequencies at 21 and 15 cy/deg were 0.613 and 0.619, respectively (p < 0.01). The determination coefficient was R2 ≥ 0.988 for all targets. An ANCOVA analysis revealed that these slopes were not significantly different from each other (p = 0.82). Additionally, accommodative error indexes were obtained to measure both the discrepancy between the regression lines and the ideal lines and the degree of correlation between the stimulus and the response.
Conclusions
Our study reveals that the low and middle spatial frequencies (< 15 cy/deg) are the most important to guide to the needed levels the accommodative response to natural images.
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The European Research Council provided financial support in the form of the Starting Grant ERC-2012-StG-309416 funding.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (name of institute/committee) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Esteve-Taboada, J.J., Bernal-Molina, P., Montés-Micó, R. et al. Accommodative stimulus-response curves to low-pass filtered natural images. Graefes Arch Clin Exp Ophthalmol 256, 1731–1737 (2018). https://doi.org/10.1007/s00417-018-3983-z
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DOI: https://doi.org/10.1007/s00417-018-3983-z