Ocular aberration measurement with and without an aperture stop using a Shack-Hartmann wavefront sensor

Area of Science:

• Optometry
• Optical Engineering
• Biomedical Optics

Background:

• Pupil size significantly influences ocular aberrations and varies individually and with environmental factors.
• Accurate measurement of ocular aberrations is crucial for understanding visual perception and correcting vision impairments.

Purpose of the Study:

• To develop and validate methods for accurately measuring ocular aberrations across different pupil sizes using a Shack-Hartmann wavefront sensor (SHWFS).
• To introduce novel relationship matrices (R(1) and R(2)) for improved wavefront reconstruction accuracy.

Main Methods:

• Proposed two relationship matrices: R(1) for wavefront reconstruction with an aperture stop and R(2) without.
• Conducted numerical simulations and experimental validations to assess the performance of the proposed matrices.
• Investigated the impact of the aperture stop and the ratio of outer area to detection aperture (ρ) on reconstruction accuracy.

Main Results:

• Matrix R(2) demonstrated significant improvement in wavefront restoration accuracy when incident beam size was inconsistent with the reconstruction aperture.
• The influence of the aperture stop on reconstruction accuracy diminished as the ratio ρ decreased.
• The proposed methods proved effective for measuring ocular aberrations under varying pupil sizes.

Conclusions:

• The developed relationship matrices, particularly R(2), enhance the accuracy of wavefront reconstruction in SHWFS measurements.
• The findings are applicable to accurate ocular aberration measurement and other variable aperture aberration analyses.
• This research contributes to more precise optical measurements in diverse applications.