While physical books do not have the additional danger of blue lights that cause eye strain and fatigue, lighting is one of the major issues faced by readers with paperbacks. As the day progresses, the light available to an individual decreases steadily, causing the eyes to work harder to focus on the words on the page. Dim light results in less blinking and greater chances of the eye drying out. The font of physical books is usually small and cannot be changed. This, too, causes the eyes to strain resulting in fatigue, headaches and a general sense of tiredness.
Some E-readers, like Kindle, are created with the technology known as e-ink
that resembles the appearance of ink on paper, reducing the impact of screen glare tremendously. Moreover, the font can be increased as per convenience, along with the brightness of the screen thus keeping in mind first and foremost the comfort of the readers.