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I don't see how this could be a problem, after all the greater IR exposure reflected into your eyes from paper books read in sunlight, should have your eyes already covered in cataracts. The same if you read on your device without the frontlight on, but in the sunlight. There would be much more Solar IR reflected back directly into your eyes, by the white paper or the device's substrata than any produced by the touchscreen.
Luck;
Ken
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