I think that's as good of a case for situational awareness as it is for strict 100% wearing of safety glasses.
If a person isn't paying attention to WHEN they should be worn then maybe it's good they wear them the whole time they're at the range.
When you get to a point in your life when prescription glasses are sometimes needed for your vision and sometimes not and you find yourself switching out between various glasses with different prescriptions and no glasses, then you'll understand where I'm coming from.
I've got three different pairs of glasses that go with me to the range: standard plano safety glasses, prescription safety-rated shooting glasses, and prescription near-vision glasses (for adjusting sights and scopes and dealing with malfunctions and such). When I'm not shooting and I'm not near anyone else shooting and when I don't need the near-vision clear focus, I prefer to wear nothing.
Age-related presbyopia will happen to everybody. Dealing with it is a PIA.