Motivated by the markup done by LensCrafters Terms like “medical-grade”, “military-grade” and “organic” often make consumers over-estimate the products' good qualities. Sometimes the test itself is too easy to pass.
For instance, “military-grade” comes from specs by the military to enable interchangeability between manufacturers. Saying something is military-grade without quoting some mil-spec, e.g. shock tests, is bogus.
Costco Kirkland is more likely to be high quality because Costco demands it from the supplier....