Development of geometric parameters metrology system for contact lens based on spectral-domain OCT

Liangcheng Duan; Wenli Liu; Zhixiong Hu; Xiang Ma; Fei Li; Baoyu Hong; Junbang Zhao

doi:10.1117/12.2643956

19 December 2022 Development of geometric parameters metrology system for contact lens based on spectral-domain OCT

Liangcheng Duan, Wenli Liu, Zhixiong Hu, Xiang Ma, Fei Li, Baoyu Hong, Junbang Zhao

Proceedings Volume 12320, Optics in Health Care and Biomedical Optics XII; 1232021 (2022) https://doi.org/10.1117/12.2643956
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

In this paper, a set of geometric parameters metrology system for contact lens based on SD-OCT (Spectral domain-optical coherence tomography) is developed and optimized, which can dealing with difficulties in measuring geometric parameters of contact lens, especially those with complex structures and surface shapes. Dispersion compensation, SNR(Signal-to-noise ratio) improvement and error compensation are introduced to improve the measurement accuracy. What’s more, the developed system is calibrated according to JJF 1148-2006. After calibration, the system meets the following indicators: test range of diameter: 8 mm-16 mm, indication error: ±50 μm; test range of center thickness: 0mm-1 mm, indication error: ±5 μm; test range of curvature radius: 6.5 mm-9.5 mm, indication error: ±20μm, repeatability of measurement: 10 μm. In addition, key parameters of a rigid contact lens with complex structure are measured, including diameter, vector height and center thickness, which can be recognized and measured automatically.

Citation Download Citation

Liangcheng Duan, Wenli Liu, Zhixiong Hu, Xiang Ma, Fei Li, Baoyu Hong, and Junbang Zhao "Development of geometric parameters metrology system for contact lens based on spectral-domain OCT", Proc. SPIE 12320, Optics in Health Care and Biomedical Optics XII, 1232021 (19 December 2022); https://doi.org/10.1117/12.2643956

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