Yes, there is a difference in the lens quality of glasses. But I often choose plastic lenses for it is lighter and cheaper than other kind of glasses. It is said that plastic lenses are easy to get scratches on them. So I often have them coated with anti-reflective coatings. This kind of coating can prevent our eyes from the damage of the reflection and glare of the computer screens. And I often take good care of them to avoid being scratched. If there are some scratches on the surface of the lenses, I will buy the cleaner to remove the scratches. But the coating will be removed at the same time.