Originally Posted by
Twin Wasp
Most airlines require that if a pilot's medical says "Must wear corrective lenses" the pilot must carry a spare set.
Originally Posted by
galaxy flyer
It’s an ICAO standard, woe to the SAFA checkee without a spare pair!
GF
Required for international (ICAO). Some, not all, airlines require a spare set for all operations.
But always a good idea, I own a spare set that lives in my flight bag. I actually use that one for FAA medical exams, it's large and clunky w/ bifocals, not very hip-looking but good for eye tests.