A viewing device for displaying rendered content comprising: a display assembly that includes an optical display that is transparent configured to display a virtual object in a select location (100, 126) on the optical display, wherein an eye viewing the virtual object has an expected gaze direction and the virtual object is viewable by the eye at a location on a side of the optical display opposing the eye; an eye tracking camera configured to capture images of the eye; and a deformation detection system, being a software module, connected to the display assembly and including a gaze angle calculation module, being a software module, connected to the eye tracking camera, and configured to calculate a gaze direction of the eye viewing the virtual object on the display assembly based on the light captured by the eye tracking camera; and the deformation detection system being configured to (i) calculate a deformation of the eye tracking camera of the display assembly based on an eye position determined by data analysis of the eye images, (ii) determining, in a plane of the display, a resultant vector between the expected gaze direction and the calculated gaze direction being an altered gaze direction that is moved relative to the expected gaze direction due to deformation of the eye tracking camera plus due to deformation of the optical display, (iii) determining, in the plane of the display, a camera deformation vector towards the altered gaze direction due to the deformation of the eye tracking camera, and (iv) determining IF an angle between the resultant vector and the camera deformation vector relative to one another is more than 90 degrees; and a correction system, being a software module, connected to the deformation detection system to display, with the display assembly, the virtual object in a corrected location (104, 134) wherein the eye viewing the virtual object in the corrected location (104, 134) has a corrected gaze direction, if the angle is more than 90 degrees, that is moved toward the expected gaze direction from the altered gaze direction in a direction opposite to a direction of deformation of the optical display calculated by deducting the camera deformation vector from the resultant vector. a display assembly that includes an optical display that is transparent configured to display a virtual object in a select location (100, 126) on the optical display, wherein an eye viewing the virtual object has an expected gaze direction and the virtual object is viewable by the eye at a location on a side of the optical display opposing the eye; an eye tracking camera configured to capture images of the eye; and a deformation detection system, being a software module, connected to the display assembly and including a gaze angle calculation module, being a software module, connected to the eye tracking camera, and configured to calculate a gaze direction of the eye viewing the virtual object on the display assembly based on the light captured by the eye tracking camera; and the deformation detection system being configured to (i) calculate a deformation of the eye tracking camera of the display assembly based on an eye position determined by data analysis of the eye images, (ii) determining, in a plane of the display, a resultant vector between the expected gaze direction and the calculated gaze direction being an altered gaze direction that is moved relative to the expected gaze direction due to deformation of the eye tracking camera plus due to deformation of the optical display, (iii) determining, in the plane of the display, a camera deformation vector towards the altered gaze direction due to the deformation of the eye tracking camera, and (iv) determining IF an angle between the resultant vector and the camera deformation vector relative to one another is more than 90 degrees; and a gaze angle calculation module, being a software module, connected to the eye tracking camera, and configured to calculate a gaze direction of the eye viewing the virtual object on the display assembly based on the light captured by the eye tracking camera; and the deformation detection system being configured to (i) calculate a deformation of the eye tracking camera of the display assembly based on an eye position determined by data analysis of the eye images, (ii) determining, in a plane of the display, a resultant vector between the expected gaze direction and the calculated gaze direction being an altered gaze direction that is moved relative to the expected gaze direction due to deformation of the eye tracking camera plus due to deformation of the optical display, (iii) determining, in the plane of the display, a camera deformation vector towards the altered gaze direction due to the deformation of the eye tracking camera, and (iv) determining IF an angle between the resultant vector and the camera deformation vector relative to one another is more than 90 degrees; and a correction system, being a software module, connected to the deformation detection system to display, with the display assembly, the virtual object in a corrected location (104, 134) wherein the eye viewing the virtual object in the corrected location (104, 134) has a corrected gaze direction, if the angle is more than 90 degrees, that is moved toward the expected gaze direction from the altered gaze direction in a direction opposite to a direction of deformation of the optical display calculated by deducting the camera deformation vector from the resultant vector.