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There isn't much risk with light emitting screens, but then outside isn't much risk either, though some places (hot or snow) it's better to have UV blocking sunglasses, or at least glasses that block UV. The cornea does block a lot of UV.
Certainly eink without the front light is more pleasant for many and whatever risk there might be gazing at LEDs with blue/UV content in near full field of vision and relatively close there is none with ambient lit eink. Cheaper and more efficient so called "white" LEDs are the worst as they have a much higher blue & UV content. Also there is less risk (whatever that risk might be) from LED room lights as you don't stare at them, you are looking at reflected light which reduces the blue and especially UV more than the rest of the spectrum.
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