Power maps and wavefront for progressive addition lenses in eyeglass frames.

Area of Science:

• Optometry
• Optical Engineering
• Vision Science

Background:

• Accurate measurement of progressive addition lenses (PALs) is crucial for vision correction.
• Eyeglass frames can introduce artifacts in optical measurements of PALs.
• Existing methods may struggle with data noise at the frame borders.

Purpose of the Study:

• To evaluate a novel method for measuring the optical properties of PALs within eyeglass frames.
• To assess the accuracy of wavefront, cylinder, and sphere measurements.
• To address challenges posed by frame-induced artifacts.

Main Methods:

• Utilized a Hartmann test-based optical system to examine PALs in frames.
• Applied Fourier analysis to extrapolate optical data beyond the frame's edge.
• Compared measurements from framed PALs with those from uncut PALs.

Main Results:

• Fourier analysis successfully removed edge artifacts from contour maps.
• The modal method, using Zernike polynomials, fitted wavefront data within a circumscribing aperture.
• Extrapolated data from framed PALs accurately matched uncut PAL data, yielding smoothed cylinder and sphere maps.

Conclusions:

• The proposed extrapolation method effectively removes edge artifacts in optical contour maps.
• This technique facilitates precise measurements of PALs, including progressive corridor dimensions, within frames.
• The method is adaptable to various eyeglass frame shapes.