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Optical Engineering

Theoretical and experimental investigation of design for multioptical-axis freeform progressive addition lenses
Author(s): Huazhong Xiang; JiaBi Chen; TianFen Zhu; YeFei Wei; DongXiang Fu
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Paper Abstract

A freeform progressive addition lens (PAL) provides a good solution to correct presbyopia and prevent juvenile myopia by distributing pupils’ optical powers of distance zone, near zone, and intermediate zone and is more widely adopted in the present optometric study. However, there is still a lack of a single-optical-axis system for the design of a PAL. This paper focuses on the research for an approach for designing a freeform PAL. A multioptical-axis system based on real viewing conditions using the eyes is employed for the representation of the freeform surface. We filled small pupils in the intermediate zone as a progressive corridor and the distance- and near-vision portions were defined as the standard spherical surfaces delimited by quadratic curves. Three freeform PALs with a spherical surface as the front side and a freeform surface as the backside were designed. We demonstrate the fabrication and measurement technologies for the PAL surface using computer numerical control machine tools from Schneider Smart and a Visionix VM-2000 Lens Power Mapper. Surface power and astigmatic values were obtained. Preliminary results showed that the approach for the design and fabrication is helpful to advance the design procedure optimization and mass production of PALs in optometry.

Paper Details

Date Published: 23 November 2015
PDF: 9 pages
Opt. Eng. 54(11) 115110 doi: 10.1117/1.OE.54.11.115110
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Huazhong Xiang, Univ. of Shanghai for Science and Technology (China)
JiaBi Chen, Univ. of Shanghai for Science and Technology (China)
TianFen Zhu, Univ. of Shanghai for Science and Technology (China)
YeFei Wei, Univ. of Shanghai for Science and Technology (China)
DongXiang Fu, Univ. of Shanghai for Science and Technology (China)

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