Materials glossary / Standard and mark
FDA impact test (21 CFR 801.410)
On the label: FDA drop-ball test · Standard and mark
What it is
The US rule that all eyeglass and sunglass lenses must survive a 5/8-inch steel ball dropped from 50 inches; plastic lenses pass by material, glass must be tempered.
Standard and marks: The marks, tests and laws behind the words on a label: karat stamps, UV400, ANSI Z80.3, the FTC Jewelry Guides, Prop 65.
In the research
No PubMed papers mention this material with jewelry, allergy or eyewear; that is usual for findings and trade terms.
Other standard and marks
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.