Virtual Reality

Virtual Reality Glossary

Let’s explain some technical terminology you will find in our articles:

Sweet spot:

The sweet spot is the area in the middle of the lens in which your pupil needs to be in order to get a clear image. Having a larger sweet spot makes it easier to position the headset in a way that gives you a clear image, and reduces risk of image blurring if the headset shifts around on your face while moving.

Chromatic aberration:

Chromatic aberration (also known as color fringing or dispersion) is a common problem in lenses which occurs when colors are incorrectly refracted (bent) by the lens, resulting in a mismatch at the focal point where the colors do not combine as they should.


The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant. More recently, the screen door effect has been an issue with virtual reality headsets and other head-mounted displays, because these are viewed at a much closer distance, and stretch a single display across a much wider field of view.

God rays: god-rays are artifacts, which look like light faint streaks or glares of light that are most noticeable when looking at bright objects against a dark background.