Do you mean on the screen?
If so, get one of these. I have one and it works great
https://www.amazon.com/Flexzion-Anti-Glare-Protector-Widescreen-Computer/dp/B018HXK7EU/ref=sr_1_1?ie=UTF8&qid=1497641800&sr=8-1-spons&keywords=anti+glare+monitor+filter+22&psc=1