From
the FAQ:
AR Coating
Early shipments of Mk2 units were mailed with lenses that were not coated with an anti-reflective (AR) coating. If you have one of these non-AR lenses, and you think that the AR coating will help you read the screen in daylight, you can contact support and they will replace the lens with an AR-coated one.
If your faceplate is non-AR, you will be able to tell because it is very shiny. If it appears to have a slight matte coating on it, then it's an AR faceplate already and there's no issue. In practice, it makes only a small difference in readability.
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