Automatic optical inspection method for soft contact lenses

Chun-Li Chang; Wen-Hong Wu; Chi-Chun Hwang

doi:10.1117/12.2182366

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17 July 2015 Automatic optical inspection method for soft contact lenses

Chun-Li Chang, Wen-Hong Wu, Chi-Chun Hwang

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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 952402 (2015) https://doi.org/10.1117/12.2182366
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

In general, the manufacture of contact lenses is conventionally labor intensive, requiring manual handling and inspection of the cast lens during production. This paper is to build an AOI (automatic optical inspection) system, which include suitable light source, camera and image processing algorithms, for contact lenses defect inspection. The mainly defect type are missing lens and surface defect on the contact lenses. An illumination system with fixed focal lens and charge coupled device (CCD) is used to capture the images of contact lenses. After images are captured, an algorithm is employed to check if there are flaws showed on the images. Five kinds of defect can be detected by the designed algorithm. A prototype of the AOI system for contact lenses inspection is implemented. The experimental result shows that the proposed system is robust for in-line inspection.

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Chun-Li Chang, Wen-Hong Wu, and Chi-Chun Hwang "Automatic optical inspection method for soft contact lenses", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 952402 (17 July 2015); https://doi.org/10.1117/12.2182366

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