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2 results about "Spherical power" patented technology
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A spherical power whose focal point coincides with the circle of least confusion of a spherocylindrical lens. Hence, the spherical equivalent of a prescription is equal to the algebraic sum of the value of the sphere and half the cylindrical value, i.e. sphere + cylinder/2.
Optical assembly
The optical assembly includes a support structure, several lens elements configured to provide overall cylindrical and spherical power. At least one actuating unit 8 is configured to laterally shift a
Owner:CAMBRIDGE MECHATRONICS
A method and system for designing freeform surfaces of progressive multifocal lenses
This invention relates to the field of progressive multifocal lens (PAL) design and manufacturing technology, specifically disclosing a method and system for designing freeform surfaces of progressive multifocal lenses. This method employs a curvature superposition (CS) algorithm instead of the traditional differential geometry (DG) algorithm, resulting in better consistency between the spherical power distribution and the design values. Based on this, a fast Fourier transform (FFT) is used to optimize the initial freeform surface, effectively reducing unwanted astigmatism and expanding the progressive corridor width, significantly enhancing visual function and wearing comfort. The manufactured product successfully replicates the simulated optical performance and maintains optimized characteristics even when combined with standard cylindrical astigmatism correction, proving the method's practicality and feasibility. This design method, combining the CS algorithm and FFT filtering, effectively improves the optical performance and wearing comfort of PAL, providing a new path for PAL design and optimization.
Owner:TIANJIN MEDICAL UNIVERSITY EYE HOSPITAL