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minor fix
eyes, while the depth of the virtual objects, and the amount of eye convergence, varies depending upon the content.
The problem is less severe in 3D TV/cinema, when it is properly taken into account during content creation and display. Part of the reason it's less severe, is that the 3D objects are never not close to the viewer.
The problem occurs because our eyes have evolved an [https://en.wikipedia.org/wiki/Accommodation_reflex accommodation-vergence reflex], which trains them to automatically adjust their optical focus (accommodation) based on the perceived distance to the objects (vergence) that they are looking at. This helps make focusing quick and accurate.
