Reduce eye strain

Three special reading modes are available to reduce eye strain. They are,

Low Blue Light Reading Mode

Blue light from either the laptop or desktop monitors are harmful to the eyes, which highly likely to cause macular degeneration or sleep disorders. In this reading mode, blue light is reduced as much as possible. The PDF pages thus turn a little bit yellowish.

Night Reading Mode

Reading with a typical white background does great harm to the eyes. In this reading mode, black and white colors are reserved, and the same applied to other colors.

Airplane Reading Mode

When you are reading on a flight, it is imperative that you do not disturb others while you are reading. Reading makes fun, however, the contrast in Night Reading Mode is too high for the sensitive eyes. It is suggested to switch to Airplane Reading Mode, because the contrast is reduced greatly.

Hot keys are convenient when you switch between the three reading modes,

F7 - Low Blue Light Reading Mode

F8 - Night Reading Mode

F9 - Airplane Reading Mode