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In simple terms, what is blue light?

Blue Light is one of the many colours that are found in the visible light spectrum (just like UV rays), but with a short, high energy wave length. It's a part of the color spectrum together with Violet, Indigo, Green, Yellow, Orange and Red, but they merge to form white light when the sun shines.
Our blue light blocking glasses have a lens structure that blocks most of the blue light from passing through and reaching your eyes because of the optical properties of the lenses. LED lights, LCD screens, phone screens, tablets and even TVs emit blue light as well.

How blue light affects the eyes

There is no reason to fear blue light. It has been linked to boosting alertness, helping memory, increasing attention spans, and regulating our circadian rhythms or sleep-wake cycle.
While more research is needed, some experts believe excess blue light can have a harmful effect on the eyes. Some experts believe that excess blue light, like UV rays, makes things trickier. Use “night mode” on your devices, wear blue light blocking glasses, and cut down on your screen time to limit your exposure.

Is it possible to reduce eye strain with blue light blocking glasses?

It has been claimed that blue light filter glasses can help to reduce eye strain when using digital devices, so some people may consider getting them. Eye strain can occur on digital screens for a number of reasons when using digital screens. However, there is not enough research evidence to prove it. You can become tired of looking at a screen for too long if you concentrate too much. If you sit too close to a screen, your eyes have to constantly shift focus, and sitting too close can strain your eyes as they try to focus on such a close image. It is also possible to squint and strain your eyes if you are wearing glasses due to glare reflected from surrounding light sources on your digital screen or glasses lenses (such as bright office lights, or a nearby window).

The overuse of digital devices is more likely to cause these issues, rather than blue light itself. Although it is easy to label these issues as the result of blue light, it's more likely that they are caused by overuse of digital devices. When you get tired, the majority of the time it's digital eye strain, and when it happens, blue light damage rarely occurs.