How do you drill a clean holes in rimless glasses?

To drill clean holes in rimless glasses, first, mark the precise locations for the holes on the lenses. Use a diamond-tipped drill bit specifically designed for glass, and ensure the drill is set to a low speed to prevent overheating and cracking. Keep the area lubricated with water or cutting oil while drilling to minimize friction and heat. Finally, apply gentle pressure and let the drill do the work, avoiding excessive force.