For me its kind of the opposite. I see the cones if I have the light on too high for the ambient light I am in. Say in the evening on the sofa that is not next to a window, or on a very cloudy day. If I go too high, over 11 in that case, the screen starts to glow and I can see the brighter spots. Its how it shows on mine, as a few brighter spots, with one in the middle being the brightest. But I don't read with light that high in darker conditions, so once I put the light back down to 10-11, the cones are gone. If I go higher to say 12-14, they are there.
At night in bed I go down to 8 and see no cones at 8-10. Anything higher would hurt my eyes anyway.
With my light set 80% at the time at 10, I never see the cones. But I do know they are there at higher levels. But since that isn't how I read, its no big deal. My Voyage has no light spots or cones, no matter how high I put the light, but I also only read it up to 11, just like the Oasis.
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