How do you protect the lens blank during the surfacing process?

• A. Place plastic film over the front of the lens to protect from heating & scratching.
• B. Wrap the lens in tape.
• C. Dip in oil.
• D. Cool with water spray.

Answer: (A)

During surfacing, the lens blank is exposed to abrasive contact and heat, which can cause scratches or surface damage. A plastic protective film placed on the front surface acts as a barrier, shielding the blank from heat and scratching while the grinding and polishing steps are performed. After finishing, the film is peeled away cleanly, leaving the surface undamaged and ready for subsequent steps. This method avoids adhesive residue and surface contamination that can come from wrapping with tape or dipping in oil, and it’s more effective than relying on water spray for protection, which only addresses cooling rather than guarding the surface.