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Computational aspects of the visual Strehl ratio
1Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia. d.iskander@qut.edu.au
Summary
A new augmented visual Strehl ratio metric is introduced to address limitations of the optical transfer function (OTF) based visual Strehl ratio. This enhanced metric offers improved robustness and better visual performance correlations, especially with larger aberrations.
Area of Science:
- Optical Engineering
- Vision Science
- Image Quality Assessment
Background:
- The visual Strehl ratio based on the optical transfer function (VSOTF) is a recently defined metric for assessing visual performance.
- The VSOTF has inherent limitations, including complexity, unboundedness, potential negativity, and sensitivity to wavefront aberrations like prisms.
Purpose of the Study:
- To identify and address the limitations of the existing VSOTF calculation.
- To propose an improved metric for objective visual performance assessment.
Main Methods:
- Analysis of the mathematical properties and limitations of the VSOTF.
- Development of an augmented visual Strehl ratio metric.
- Comparison of the augmented metric with the VSOTF, particularly concerning residual prism presence and rotational symmetry.
Main Results:
- The proposed augmented visual Strehl ratio overcomes the identified limitations of the VSOTF.
- The augmented metric demonstrates greater robustness when residual prisms are present in the wavefront aberration.
Conclusions:
- The augmented visual Strehl ratio offers a more reliable measure of visual performance compared to the VSOTF.
- Preliminary studies suggest the augmented metric may yield stronger correlations with actual visual performance, particularly in cases with significant aberrations.
