Page "Glasses" Paragraph 5

An unpopular aspect of glasses is their inconvenience.

Though modern frames can be both lightweight and flexible, and new lens materials and optical coatings are resistant to breakage or scratching, glasses can still cause problems during rigorous sports.

Visibility can be significantly reduced by becoming greasy, trapping vapour when eating hot food, swimming, walking in rain or rapid temperature changes ( such as walking into a warm building from cold temperatures outside ).

Scraping, fracturing, or breakage of the lenses require time-consuming and costly professional repair.