A quick inspection before the safe-zone briefing can prevent a serious injury and a wasted game day.

Hold the eye protection up to the light. Look for cracks, deep scratches, crazing, loose screws, stretched straps and brittle seals. Damage, age and harsh cleaning products can reduce confidence in equipment that once passed a test.
Find the permanent manufacturer and standard markings and compare them with the product information. UK guidance requires PPE placed on the GB market to have the relevant conformity marking and supporting documentation; BSI describes EN 166 as the personal eye-protection specification with requirements for marking and testing.
Adjust the strap so the protection sits securely without a gap around the eyes. Put it on before entering the live area and leave it on until a marshal confirms it is safe to remove. If another player removes theirs in a live area, call it out rather than ignoring it.