Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent glasses

These are excellent glasses. I wear them when performing surgery, along with the Chums cotton strap that attaches to the earpieces. They fit very comfortably, and the vented lens feature is amazing. These glasses will not fog up at all. The nose piece is very comfortable and they are light enough that I can forget that I'm wearing them while I'm working. Highly recommended!