（2025·安徽合肥·三模）Blue Light Protection Guidelines
What is blue light?
When we look at digital screens, we expose ourselves to large amounts of blue light. This type of exposure isn’t as dangerous as the type of radiation we get from X-rays or ultraviolet light (紫外线), but studies have suggested too much exposure can lead to digital eye strain (疲劳) and retinal (视网膜) damage. In addition, blue light also affects sleep schedules.
What are blue light glasses?
Blue-light glasses work to reduce the intensity of short-wavelength light. They are marketed to help with eye strain by blocking blue light, thus improving sleep quality.
Do they work?
Will they improve your health? The answer is that we don’t know. The current research regarding the impact of blue light on our eyes, as well as the effectiveness of blue-light blocking glasses, has been generally inconclusive. One study suggests blue light glasses may help protect the retina from long-term blue light exposure. However, another study concludes there’s a “lack of high-quality evidence” to support their effectiveness in reducing eye strain, improving sleep quality, or preventing retinal damage.
Usage recommendations
Over-reliance on blue light glasses without breaks may worsen eye strain. Spending days glued to your computer can be hard on your well-being, so be sure to take regular breaks and take care of your health. Notes
If a pair is outside of your budget and you’ re looking for other ways to ease eye strain, try the 20-20-20rule: every 20 minutes spent on a screen, take a break to look at an object 20 feet away for at least 20 seconds.
216．What are blue-light glasses designed to do?
A．Block ultraviolet rays completely. B．Prevent long-term retinal damage.
C．Block blue light for eye comfort. D．Improve sleep quality dramatically.
217．How does the author think of the impact of blue-light glasses?
A．Supportive. B．Uncertain. C．Unconcerned. D．Enthusiastic.
218．What is the author’s main advice for reducing eye strain?
A．Wear blue-light glasses when using screens.
B．Avoid spending too much time on the computer.
C．Combine healthy screen habits with regular breaks.
D．Use the 20-20-20 rule instead of wearing glasses.
【答案】216．C 217．B 218．C
【知识点】科普知识 、说明文
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