METHOD FOR AUTOMATIC INSPECT OF CONTACT LENSES

摘要

Described herein is a method for automatically inspecting contact lenses having printed markings thereon for cosmetic defects. The method involves use of a colored optical filter to effectively eliminate the printed markings from the image being presented to the automated inspection system, thus preventing false rejects, while at the same time preventing the masking of actual defects.

主权项

1. A method for automatically inspecting contact lenses having printed markings thereon for cosmetic defects, the method comprising the steps of:
(1) illuminating, with a white light, a contact lens having printed marks thereon with a white light, wherein the printed marks are composed of a colorant that transmits only a first light of wavelengths to impart a desired color; (2) taking an image of the contact lens from a second light that is transmitted through the contact lens and a color filter, wherein the color filter is capable of transmitting only the first light; and (3) analyzing the image for detecting cosmetic defects in the contact lenses.