Headset-based system for measuring binocular alignment

A system to determine a binocular alignment, comprising:

• a headset, having a stereo display and an eye tracker, configured
• (a) to measure a disassociated phoria of a patient at a first simulated distance by
• presenting fusible images including targets for a first eye and a second eye with a first parallax corresponding to the first simulated distance, using the stereo display of the headset at a screen distance;
• presenting non-fusible images by presenting the target for a first eye with the first parallax and presenting a disassociated targetless image for the second eye, using the stereo display of the headset at the screen distance, and
• measuring the disassociated phoria of at least one of the first eye and the second eye in response to the presenting of non-fusible images, using the eye tracker of the headset;
• and
• (b) to determine a vergence of the patient at the first simulated distance by
• presenting fusible images for the first eye and the second eye with the first parallax, corrected with the measured disassociated phoria, using the stereo display of the headset at the screen distance;
• measuring an associated phoria in response to the presenting of fusible images, using the eye tracker;
• and
• determining the vergence as a combination of the parallax, the disassociated phoria and the associated phoria.