Reduce your eyestrain by using a Kindle light when reading at night. It can reduce the glare from the screen in a darkened room. Many of these lights come attached to a cover or you can find ones that clip on.
Some are adjustable so you can have the right amount of lighting that you need.They are usually designed to work with any Kindle, but it's easy to find specific models with a cover. A Kindle light makes reading even more enjoyable.