Described herein are techniques and mechanisms for eye tracking based defocusing. According to various embodiments, video content may be transmitted from a server for presentation at a remote computing device in communication with the server via a network. Eye tracking information identified via an optical sensor at the client machine may be received from the remote computing device. The eye tracking information may describe a state of one or both eyes of an individual located proximate to the remote computing device. A first portion of the video content on which the eyes are more focused relative to a second portion of the video content may be identified. The video content may be updated based on the received eye tracking information. The second portion of the video content may be defocused relative to the first portion of the video content in the updated video content.