I sew late at night too but have never had eye problems. I have astigmatism, and am near and far-sighted (one eye is near and one is far). I have to wear my glasses for everything but using the computer. I have an OTT light near my sewing machine and a faux OTT light over my cutting area. I do have a mixture of bulbs in the room so maybe that is what is helping me. I have an overhead light/fan that I never use. I do not like overhead lights like that. I would like to add some halogen lights, as I prefer them over everything else.