When I first started out fitting steel I did not use dark cutting glasses when I used a cutting torch. I already where contacts and glasses, but in 3 months my eyes had gotten weaker and my prescription had to be increased by three power. In a year you might need to increase one or half power, and most years they stay the same. My eye doctor told me that a cutting torch and plasma cutter were hard on your eyes if you do not wear cutting glasses or goggles. Since then I always wear cutting glasses or a #5 face shield. It takes a little getting use to at first, but after a while you will not cut without them. I hate not being able to see when I am cutting.