Understanding and Treating TBI Associated Photophobia With Botulinum Toxin Type A and Its Impact on Visual Function

Inclusion Criteria: * Recruit and enroll male and female subjects, civilians and veterans (1:1 mix anticipated, i.e., n = 25 from each group) of all races and ethnicities. * ≥18 years of age who are able to consent. * Report chronic photophobia (Numerical Rating Scale ≥4 on a 0-10 scale, photophobia present ≥6 months) with a remote history of TBI (\>1 year). * Inclusion into the study with regard to TBI status will be based on the Department of Defense Standard Surveillance Case Definition for TBI Adapted for Armed Forces Health Surveillance Division (AFHSB) Use. This can include one hospital…