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Computers have been around for 40 years. TVs even longer.

We would know pretty definitively if they degraded your eyes.

Do you have some evidence we are all missing out on ?

Fine. Shining lights in your eyes improves vision.

Your eyes are always receiving light, that's how they work. It's not at all obvious to me why an LCD backlight would be different from sunlight or an incandescent light or any other light source.

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