Clinical Research Directory

Inclusion criteria: * Adults 18 years of age or older. * Normal or corrected to normal bilateral vision. * Ability to sit and look forward for periods of at least 5 seconds. * Communicate in English with the study team. Exclusion criteria: * Visible or known injuries to eye or eye socket. * Non-intact periorbital skin * Oculomotor palsy * Strabismus (cross-eyedness) / impaired ocular mobility * Inability to refrain from alcohol, cannabis or other recreational drugs for 24 hours prior to study visit. * Inability or unwillingness to remove scleral contact lenses or glasses for the length of the study visit. * Conditions, not explicitly described, identified by clinical exam, which would make achieving a measurement impractical or uncomfortable for the participant.