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{{main|Latency}}'''Motion -to-photon latency''' also known as the '''End-to Photon Latency -end latency''' is the delay or [[latency]] between the movement of the user 's head and the change of the [[VR]] views device's display reflecting the user's movement. As soon as the user's head moves, the VR scenery should match the movement. The more delay (latency) between these 2 actions, the more unrealistic the VR world seems. To make the VR world realistic, VR systems want low latency of <20ms and even really low latency of <7ms to 15ms.