Image correction due to deformation of components of a viewing device

A viewing device for displaying rendered content comprising:

• a display assembly including an optical display configured to display a virtual object in a select location on the display assembly, wherein an eye viewing the virtual object has an expected gaze direction;
• and
• a deformation detection system connected to the display assembly and including:
• an eye tracking camera configured to capture light reflected from the eye;
• and
• a gaze angle calculation module configured to detect a measured gaze direction of the eye viewing the virtual object on the display assembly, wherein the deformation detection system includes an attention generation unit configured to alter the display of the virtual object and attract a user's attention to the virtual object before detecting the measured gaze direction, and calculate a deformation of the display assembly based on the measured gaze direction, wherein the measured gaze direction that is calculated by the gaze angle calculation module is an altered gaze direction due to deformation of the eye tracking camera and the optical display, wherein the altered gaze direction due to deformation of the eye tracking camera is represented by a camera deformation vector calculated from a difference of eye center positions with respect to the eye tracking camera between a current eye center position and an initial eye center position when the display assembly is still new, and wherein the altered gaze direction due to deformation of the optical display is calculated by deducting the camera deformation vector from a resultant vector representing the measured gaze direction.