Compact and aberration effects-shielded objective intraocular scatter measurement system

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Optics

Background:

• Intraocular scatter measurement is crucial for assessing visual quality.
• Existing methods can be influenced by ocular aberrations, affecting accuracy.
• Objective scatter index (OSI) offers a non-invasive approach to quantify scatter.

Purpose of the Study:

• To develop a compact double-pass (DP) system for accurate intraocular scatter measurement.
• To eliminate the confounding effects of ocular aberrations on scatter quantification.
• To enhance the clinical applicability of intraocular scatter assessment.

Main Methods:

• Utilized a dual-channel system: one for far-field DP point spread function (PSF) imaging, another for Shack-Hartmann wavefront aberration detection.
• Calculated an initial objective scatter index (OSI0) from the DP PSF image.
• Reconstructed aberration-induced PSF and determined aberration influence coefficients.
• Subtracted aberration influence from OSI0 to obtain an aberration-corrected objective scatter coefficient.

Main Results:

• The proposed system successfully eliminated the influence of aberrations on scatter measurements.
• Measurement accuracy improved by 11.9% (4 mm aperture) and 28.9% (6 mm aperture) after aberration correction.
• The system maintains a compact size and low manufacturing cost.

Conclusions:

• The developed compact DP system provides accurate, aberration-free intraocular scatter measurements.
• This technology is suitable for clinical applications due to its accuracy, cost-effectiveness, and compact design.
• Objective scatter measurement with aberration correction holds promise for improved ophthalmic diagnostics.