If a VR device is rendering at 90 Hz, what is the target latency in milliseconds?

When a VR device is rendering at a frequency of 90 Hz, it means that the device is displaying a new frame 90 times every second. To calculate the target latency in milliseconds, you can use the formula:

[ \text{Latency} = \frac{1 \text{ second}}{\text{refresh rate (in Hz)}} \times 1000 ]

In this case, with a refresh rate of 90 Hz:

[ \text{Latency} = \frac{1}{90} \times 1000 \approx 11.11 \text{ milliseconds} ]

This value is generally rounded to 11 milliseconds. Achieving this target latency is crucial for providing a comfortable and immersive VR experience, as lower latency helps in reducing motion sickness and enhances the responsiveness of user interactions.

Regarding the other options, the figures would either be too high or too low compared to the ideal threshold for VR applications, which is why they do not align with the calculated latency based on the 90 Hz refresh rate.