No, actually the regulation is fairly precise.
The regulation at 21 CFR 801.410(d)(2) describes the exact procedure for the impact test. The regulation states, "In the impact test, a 5/8-inch steel ball weighing approximately 0.56 ounce is dropped from a height of 50 inches upon the horizontal upper surface of the lens. The ball shall strike within a 5/8 inch diameter circle located at the geometric center of the lens. The ball may be guided but not
restricted in its fall by being dropped through a tube extending to within approximately 4 inches of the lens..."
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