How Corrective Lenses Work | 合法醫療器材資訊網

Correctivelenses,then,areprescribedtocorrectforaberrations,toadjustthefocalpointontotheretinaortocompensateforotherabnormalities.Youcanread​ ...

Step 10: A pattern in the shape of the frame is inserted in the edger. Patterns are commonly plastic and may be supplied by the frame manufacturer or made in the lab.

Newer edgers do not use patterns; instead, the shape is determined by a probe that measures the frame and stores the information in a computer, which in turn controls the edging operation. As it operates, the slowly turning lens is brought into the fast turning cutting surface, which is either a grinding wheel or steel blades, until a guide contacts the pattern, which is rotating to match the lens. If the frame has a complete rim surrounding the lens, a bevel, or ridge, is cut along the edge of the lens that will fit into a groove in the frame; otherwise, the edge is left flat.

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