Which description best fits a lens blank before edging?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which description best fits a lens blank before edging?

Explanation:
In lens manufacture, the front surface is the optical surface that carries the prescribed power, so it is ground and polished to specification before any edging is done. The back surface is left unfinished at this stage to allow the edging process to trim the periphery and set final thickness without disturbing the crucial front surface. Coatings aren’t applied yet; they come after edging. So the description that fits best is that the lens blank is finished on the front only.

In lens manufacture, the front surface is the optical surface that carries the prescribed power, so it is ground and polished to specification before any edging is done. The back surface is left unfinished at this stage to allow the edging process to trim the periphery and set final thickness without disturbing the crucial front surface. Coatings aren’t applied yet; they come after edging. So the description that fits best is that the lens blank is finished on the front only.

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