1. Glasgow Coma Scale score of equal to or less than 13 at the time of study enrollment

2. Under the influence of alcohol or drugs

3. Previous eye surgery

4. Visual acuity known to be 20/200 or less in either eye

5. Known strabismus, amblyopia (lazy eye), or double vision

6. Known eye movement disorder, including nystagmus

7. Known optic nerve disease, including papilledema or optic neuropathy

8. Known retinal disease, including macular degeneration or retinal degeneration

9. Known cataract

10. History of neurosurgery

11. History of stroke/brain hemorrhage, brain tumor, or epilepsy

12. Any head trauma requiring medical attention from a physician within the last 6 months

13. Diagnosed dementia or cognitive impairment requiring assistance for daily living

14. Other condition(s) under the care of a neurologist

15. Psychiatric hospitalization in the last 90 days

16. Subject considered unsuitable for participation in this clinical trial by PI, treating clinician, or study research staff

17. Any minor brain injury regardless of loss of consciousness

HITT for the Identification of Mild Traumatic Brain Injury