Use these every day. I found that if I used plastic lens glasses they would bet too hazy too fast and taking them on an off, soldering under a microscope, etc., I would get headaches. After trying these out I no longer get headaches and prefer the clear frame. . Only reason for 4 stars is they are too wide for my head and will slide off my head if I look down. I mitigate by heating the nose bridge and bending them inward. Then they stay on no matter the angle.