Measurements and acronyms
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This page lists measurements and acronyms.
PPD (pixels per degree) is a measure of the resolution of a display. It is generally superior to PPI (pixels per inch) when measuring near-eye displays. PPD takes into account the distance from the eyes as well.
IO or I/O stands for input/output.
PVA stands for polyvinyl alcohol. It is a type of polymer or plastic.
AoA is angle of arrival.