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==Pixel density in Virtual Reality==
==Pixel density in Virtual Reality==
[[Virtual Reality#Devices|Virtual reality head-mounted displays]] require high pixel density because the screen is very close to the user's eyes. An [[HMD]] with low pixel density can cause blurring of words and objects, reduction of [[immersion]] and elimination of [[presence]]. In [[VR]] PPI is just as important if not more important than resolution.
[[Virtual Reality#Devices|Virtual reality head-mounted displays]] require high pixel density because the screen is very close to the user's eyes. Higher PPI leads to sharper images with more details. An [[HMD]] with low pixel density can cause blurring of words and objects and the "screen door effect". In [[VR]] PPI is just as important if not more important than resolution as a parameter to judge HMDs.


As pixel density increases, lower [[persistence]] is needed to avoid blurring.
As pixel density increases, lower [[persistence]] is needed to avoid blurring.