Electronic devices—including computers—are known to emit blue light, which can have long-term effects on your eyes. “High energy visible light (HEV) is high frequency/short wavelength light in the violet/blue band (400-450 nm) of the visible light spectrum. HEV, which is emitted by digital screens, is closest to that of potentially harmful Ultraviolet light (100-400nm), so there has been concern about the safety of using these devices without protection—such as eyeglass lenses which block blue light (‘blue blockers’),” Dr. Berman explained.
While some exposure is normal, excessive screen time can increase the chance of developing an ocular condition. “Ordinarily, we receive doses of blue light from a number of other sources, chief among them being sunlight, plus man-made, indoor sources of blue light such as flat screen televisions, fluorescent and LED lighting to which we are exposed,” Dr. Berman said. “It’s known that UV/blue light can contribute to cataracts and other ocular conditions (this is the purpose of wearing sunglasses outside).”
The best way to avoid too much blue light exposure is to get your hands on a pair of blue light blocker lenses. “If you are a frequent screen user (especially at night), or tend to hold a device close to your eyes, you might want to consider blue blocker lenses, especially if vision concerns have been expressed by your Eye Care Professional,” Dr. Berman added. “Be advised, however, that these lenses will not protect your eyes from fatigue and other symptoms associated with excessive screen use.”