September 2023
Volume 23, Issue 11
Open Access
Optica Fall Vision Meeting Abstract  |   September 2023
Poster Session: Peripheral blur may provide the eye with a cue for the sign of defocus
Author Affiliations
  • Len Zheleznyak
    Clerio Vision, Inc.
Journal of Vision September 2023, Vol.23, 83. doi:https://doi.org/10.1167/jov.23.11.83
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      Len Zheleznyak; Poster Session: Peripheral blur may provide the eye with a cue for the sign of defocus. Journal of Vision 2023;23(11):83. https://doi.org/10.1167/jov.23.11.83.

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

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Abstract

The sign of defocus is used by the retina to guide emmetropization. However, the means by which the eye determines whether light is focused in front of, or behind the retina, remains elusive. In the current study, we propose a new cue for the sign of defocus: the orientation of the anisotropic peripheral blur. Previously published [1] population averages of wavefront aberrations across the horizontal visual field in hyperopes, emmetropes and myopes were used to assess peripheral optical quality and blur orientation. Due to the large magnitudes of off-axis astigmatism and coma, the peripheral retinal image quality was dominated by anisotropic blur, whose direction was also correlated with refractive error (vertically elongated peripheral blur in myopic eyes and horizontally elongated peripheral blur in emmetropic and hyperopic eyes). The differences in groups may be due to the interaction between peripheral wavefront aberrations and globe shape (i.e. peripheral axial length). We also found an interaction between longitudinal chromatic aberration and off-axis astigmatism, wherein peripheral blur orientation is wavelength dependent, raising additional questions pertaining to the nature of chromatic cues. The orientation of peripheral blur may provide the retina with an optical cue for the sign of defocus, potentially playing an important role in emmetropization. [1] Romashchenko et al., "Peripheral refraction and higher order aberrations." Clin Exp Optom 103.1 (2020): 86-94.

Footnotes
 Funding: Funding: NSF STTR Phase I: NSF/IIP 1549700; NSF STTR Phase II: NSF/IIP 1738506
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