1. A method for automatically measuring a subject's phoria while the subject fixates on a visual target, comprising: covering and uncovering at least one of the subject's eyes; capturing a sequence of images of the at least one of the subject's eyes after uncovering the at least one of the subject's eyes using an image capturing device, a first image of the sequence of images including a first reflection of light from the at least one of the subject's eyes and a second image of the sequence of images including a second reflection of light from the at least one of the subject's eyes, wherein the first image and the second image are captured at different times after uncovering the at least one of the subject's eyes; comparing a position of the first reflection of the light within the first image of the sequence of images to a position of the second reflection of the light within the second image of the sequence of images to determine a magnitude and a direction of any movement after the at least one of the subject's eyes is uncovered; and determining a phoria measurement based on the determined magnitude and direction of the movement after the at least one of the subject's eyes is uncovered.