What are those screen covers for computer monitors called?

Q: I have heard of computer screen covers/protectors that are designed to help reduce the risk of seizures and migraines by blocking some sort of light ( I want to say they are LEDs, but maybe it's something else) What are the covers called and where can I find them? Call the optomotrist, right?! I still don't know what they are called, but they are Anti-Glare screen protectors AND block UV coming from the computer screen.

A: Clear ultra-thin plastic with low tack adhesive (leaves no residue when removed). Polyester hard coated to prevent scratches and extend useful life. you can find it on http://www.protectcovers.com/screen_protectors.htm

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