Resolution
Resolution matters in VR if you want to avoid the screen door effect, which looks like a grid due to visible pixelated lines on the screen. Think of an old computer with poor resolution — you might see a grid of fine lines on the screen as you use it. Most existing VR headsets still have the screen door effect to some degree, but you can minimize the effect by purchasing a high-resolution headset. The highest resolution consumer VR headset is the HTC Vive Pro 2, which has a resolution of 2,448 x 2,448 pixels per eye.
View
How many virtual worlds do you want to see at once? Field of view is a measure of how much of the virtual world you see at once. Human vision is limited to about 220 degrees, and the Pimax 8K/5K+ headphones come close to that field of view at 170 degrees.
Refresh rate
The refresh rate tells you how many images are generated per second. You want a high refresh rate to keep your VR experience lag-free and to see realistic, natural visuals. The refresh rate can affect how disorienting you get with your VR headset on — you want your eyes to keep up with the image and you want the visuals to keep up with the action. If the refresh rate is below 90fps, you may experience disorientation and nausea while wearing the headset. The Valve Index has a refresh rate of up to 144 Hz, making it one of the best choices for a smooth VR experience.
Location tracking
Location tracking detects your position relative to your surroundings in a virtual environment. It differs from head tracking, which only considers head rotation because it records forward/backward, up/down, left/right, and other overall body movements.
Display
The VR headset consists of a display, sound, sensor, and controller. You’ll want the highest resolution you can afford here to minimize the mesh effect
Pixels per degree
Pixels per degree, or pixel density, is calculated by taking the total number of pixels in a horizontal display line and dividing it by the horizontal field of view. For example, the HTC Vive has 1080 pixels per eye and a 100-degree field of view, giving a pixel density of 11 pixels per degree. Remember that the human eye sees about 60 pixels per degree.
