MacBook Pro 13 inch: Matte Screen Protector?

I was working in class today under some pretty harsh lighting. I have to make the battery last the entire day, so I try to keep the brightness pretty low. Unfortunately, this causes the harsh lighting from above to be pretty apparent when the screen is at a comfortable angle.

After a while I found this to be distracting when trying to focus on any work. Are there any good options for a matte screen cover/protector? I would like the added bonus of a matte display, without having to use a larger, more expensive MacBook.

Thank you for any suggestions!