Assessing visual function

An assessment device for assessing visual functions of a test subject, comprising:

• at least one processor, memory, a visual stimulus unit, a platform, and at least one input device, wherein the assessment device is formed to create an enclosed area defined at least by the platform providing an area for the test subject to i) stand on the platform during a testing procedure and ii) move freely during the testing procedure;
• wherein the assessment device is configured to operate the testing procedure comprising:
• receiving the test subject in the enclosed area on the platform;
• displaying, using the visual stimulus unit, visual stimuli to the test subject on the platform in the enclosed area;
• tracking head movement of the test subject, i) using the at least one input device and ii) while the visual stimuli is being displayed to the test subject on the platform in the enclosed area configured to monitor movement of the test subject comprising tracking a plurality of points of a head of the test subject, a first point being associated with a first ear of the test subject, and a second point being associated with a second ear of the subject, and a third point being associated with a snout of the test subject;
• and
• determining a relationship between the head movement of the subject and the visual stimuli;
• and wherein the assessment device is configured to determine if a head pausing count reaches one or more times a variable value before a head tracking movements count reaches the variable value,
• wherein at which point the assessment device is configured to determine that the test subject cannot see the visual stimuli, and the processor is configured to set the visual stimuli at a higher contrast or at a lower spatial frequency.