1. A method, comprising: receiving a light beam from a model eye at an optical measurement instrument having an optical axis; producing image data, including light spot data for a plurality of light spots, from the received light beam; determining an observed location of a corneal reflex from the model eye within an image representing the image data; and determining an angle of misalignment between an axis normal to a front surface of the model eye and the optical axis of the optical measurement instrument from the observed location of the corneal reflex within the image.