Difference between revisions of Eye strain

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* '''The screen is too close to eyes'''. The screen should, ideally, be at least an arm's length away from the eyes. With tiny phone screens, this is impractical; the bad habit of doing everything on the phone should be replaced with a good habit of doing as much as possible on a desktop or laptop computer at a healthy distance from the eyes.

* '''The staring is being done without reasonable breaks'''. At the very least, the eyes should be given a short break every 20 minutes and a long break every 60 minutes.

* '''The screen is low-quality or uses old technology'''. The old CRT technology is rarely used now, but be aware that its inherent flicker strains the eyes. The human eye certainly struggles when viewing light that flickers on and off 60 times per second! Unfortunately, even the current display technology, LCD, can flicker. Low-quality LCDs ~~come with~~ use PWM dimming, where the backlight is switched on and off hundreds of times per second. High-quality LCD displays are designed with DC dimming, where the light is constant.

* '''The screen is low-quality or uses old technology'''. The old CRT technology is rarely used now, but be aware that its inherent flicker strains the eyes. The human eye certainly struggles when viewing light that flickers on and off 60 times per second! Unfortunately, even the current display technology, LCD, can flicker. Low-quality LCDs use PWM dimming, where the backlight is switched on and off hundreds of times per second. High-quality LCD displays are designed with DC dimming, where the light is constant.

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 * '''The screen is too close to eyes'''. The screen should, ideally, be at least an arm's length away from the eyes. With tiny phone screens, this is impractical; the bad habit of doing everything on the phone should be replaced with a good habit of doing as much as possible on a desktop or laptop computer at a healthy distance from the eyes.
 * '''The staring is being done without reasonable breaks'''. At the very least, the eyes should be given a short break every 20 minutes and a long break every 60 minutes.
-* '''The screen is low-quality or uses old technology'''. The old CRT technology is rarely used now, but be aware that its inherent flicker strains the eyes. The human eye certainly struggles when viewing light that flickers on and off 60 times per second! Unfortunately, even the current display technology, LCD, can flicker. Low-quality LCDs come with use PWM dimming, where the backlight is switched on and off hundreds of times per second. High-quality LCD displays are designed with DC dimming, where the light is constant.
+* '''The screen is low-quality or uses old technology'''. The old CRT technology is rarely used now, but be aware that its inherent flicker strains the eyes. The human eye certainly struggles when viewing light that flickers on and off 60 times per second! Unfortunately, even the current display technology, LCD, can flicker. Low-quality LCDs use PWM dimming, where the backlight is switched on and off hundreds of times per second. High-quality LCD displays are designed with DC dimming, where the light is constant.

Difference between revisions of Eye strain

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