Poor storage prior to you buying them?
I side w @dragonvoi that any temperature shock would be bad for lenses.
So be careful not to use excessively hot water when the glasses are cold. Or cold water when glasses are hot from outdoor usage.
I side w @dragonvoi that any temperature shock would be bad for lenses.
So be careful not to use excessively hot water when the glasses are cold. Or cold water when glasses are hot from outdoor usage.