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Peripheral optical anisotropy in refractive error groups.

Len Zheleznyak¹

¹Clerio Vision, Inc., Rochester, New York, USA.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)

|February 8, 2023

Summary

This summary is machine-generated.

Peripheral blur orientation differs between emmetropes, myopes, and hyperopes. Myopes exhibit vertically elongated blur, unlike emmetropes and hyperopes, impacting visual development and myopia control strategies.

Keywords:

aberrations hyperopia myopia optical anisotropy optics refractive error retinal image quality

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Area of Science:

Ophthalmology and Vision Science
Optical Engineering
Physiological Optics

Background:

Peripheral image quality is influenced by optical aberrations and retinal shape.
Peripheral blur anisotropy may play a role in accommodation, emmetropization, and myopia control.

Purpose of the Study:

To investigate peripheral through-focus optical anisotropy and image quality.
To determine how these optical properties vary with the eye's refractive error.

Main Methods:

Utilized published Zernike coefficients across retinal eccentricities (0-30° nasal visual field).
Computed through-focus modulation transfer function (MTF) for a 4mm pupil.
Defined image quality as the volume under the MTF and blur anisotropy as the horizontal-to-vertical meridian ratio (HVRatio).

Main Results:

Emmetropes' peak image quality was near the retina; myopes' was behind, and hyperopes' was in front.
At the retina, emmetropes and hyperopes had horizontally elongated blur, while myopes had vertically elongated blur.
Blur anisotropy (HVRatio) varied significantly with refractive error and eccentricity.

Conclusions:

Peripheral blur is dominated by oblique astigmatism, providing a defocus sign cue.
All groups showed anisotropic blur, with myopes exhibiting a distinct vertical blur orientation.
These findings are crucial for understanding visual development and optical myopia control interventions.