Vergence–accommodation conflict

Common card · No. 492843

Vergence–accommodation conflict (VAC), also known as accommodation–vergence conflict, is a visual phenomenon that occurs when the brain receives mismatching cues between vergence and accommodation of the eye. This commonly occurs in virtual reality devices, augmented reality devices, 3D movies, and other types of stereoscopic displays and autostereoscopic displays. The effect can be unpleasant and cause eye strain. VAC happens due to two main visual system responses being mismatched when viewing a 3D display: vergence of eyes and accommodation of the eyes. Both of these mechanisms are crucial in stereoscopic vision. Vergence or independent inward/outward rotation of eyes is engaged to fixate on objects and perceive them as single. Incorrect vergence response can cause double vision. Accommodation is the eye's focusing mechanism and it is engaged to produce a sharp image on a retina. Both of these mechanisms are neurally linked forming the accommodation-convergence reflex of eyes. One can...

Read on Wikipedia · Image Rosedaler, CC BY-SA 4.0