Glazers are a type of artisan who can repair broken equipment in Stardew Valley. In order to become a Glazier, you must be level 10 in the Cooking and Crafting Skills. You then must purchase the Glassblowing and Kiln from the Carpenter’s Shop.
If your glasses are broken in Stardew Valley, you can use a gold ingot and a hammer to repair them. This will return your glasses to 100% condition. The gold ingot can be found in the mines, or bought from Krobus for 500g.