Discussion
Which restoration treatment addresses a yellowed polycarbonate lens?
Answer: D
The factory ultraviolet coating degrades, and polishing without recoating leaves the lens to yellow again within months. Wet sanding is genuinely part of the process, which makes the last option a real step described as if it were the whole job. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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