The wide-angle point spread function of the human eye reconstructed by a new optical method

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• The human eye's point spread function (PSF) describes how light spreads on the retina.
• The central PSF relates to optical aberrations, while peripheral zones involve light scattering.
• Existing methods primarily measure the central PSF, neglecting peripheral scattering effects.

Purpose of the Study:

• To develop a novel optical method for accurately reconstructing the wide-angle PSF in the living human eye.
• To enable direct, in vivo measurement of intraocular light scattering up to 8 degrees of eccentricity.
• To advance the comprehensive optical evaluation of the human eye's optics.

Main Methods:

• Projecting uniform radiance disks onto the retina.
• Recording reflected and double-passed images through the eye's optics.
• Analyzing recorded images to reconstruct the wide-angle PSF.

Main Results:

• Successfully reconstructed the wide-angle PSF in living human eyes up to 8 degrees.
• Demonstrated the technique's ability to measure intraocular scattering, even when artificially induced.
• Validated the accuracy of the new optical method for in vivo PSF measurement.

Conclusions:

• The new method provides direct, accurate, in vivo measurement of intraocular scattering.
• This technique facilitates a more comprehensive optical evaluation of the human eye.
• It addresses the gap in measuring the peripheral PSF, crucial for understanding visual function.