Why is it forbidden to wear glasses when leaving the plane during an emergency?
This is because they don't want people holding up the evacuation by searching for their glasses.   It does not mean you are not allowed to bring glasses if you are wearing them but passengers blocking the aisle to search for their glasses would slow the evacuation and risk lives.   They do want you to actually take off your high heels and leave your luggage because these can actually slow you down.   This should be portrayed more clearly.