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{{see also|Social presence}}[[Presence ]] is the feeling of being physically and spatially located in an environment. [[VR]] allows us, for the first time, to feel Presence in another realm, in a virtual realm. It is one of the most important yet indescribable factors of VR.
Presence can be divided into 2 types: Cognitive Presence and Perceptive Presence. Cognitive Presence is the presence of your mind. It can be achieved by watching a compelling film or reading an engaging book. Cognitive Presence is important to an immersive experience of any kind. Perceptive Presence is the presence of your senses. To accomplish Perceptive Presence, your senses, sights, sound, touch and smell, have to be tricked. Perceptive Presence can only be achieved by [[Virtual Reality]] and [[Augmented Reality]].
*Comfortable eyebox - the minimum and maximum eye-lens distance wherein a comfortable image can be viewed through the lenses.
*High quality calibration and correction - correction for distortion and [[chromatic aberration ]] that exactly matches the lens characteristics.<ref name="OC2014 Iribe">Oculus Connect 2014: Brendan Iribe Keynote</ref>
==Augmented Reality==
Presence is equally important to an immersive [[AR]] experience. To achieve Presence in [[Augmented Reality]], seamless integration of virtual content and physical environment is required. Like in VR, the virtual content has to align with user's expectations. One theory is that to have truly immersive AR, user cannot discern virtual objects from real objects.
==Additional reading==
http://www.ehrssonlab.se/publications.php
http://webstaff.itn.liu.se/~matco/TNM053/Papers/presence.pdf
==References==
