Bought shield to fit my PC and this has reduced my frequent migraines after being in front on PC. I also suffered from light headeness and dizzy turns. I've since bought the clip ons as well and this has stopped both migraines and these nasty effects, using both together. I have now ordered full glasses, which I intend to wear over the top of my computer specs. If thgis is successful I will probably order prescription glasses to my computer prescription. Company wise, Ocushield provide fast delivery, good communication and the products seem excellent and the web site is pretty easy to navigate. Others take note!