Casual Observers

Inclusion Criteria:

• 18 years or older.
• Normal eye movements and binocular vision (with or without correction).
• Ability to speak and read English.

Exclusion Criteria:

• Age less than 18 years old.
• Eye movement limitations such as spontaneous nystagmus or strabismus.
• Monocular vision.
• Psychiatric condition as studies have shown that individuals with psychiatric conditions (particularly schizophrenia and autism spectrum disorder) result in altered visual attention to the face. 
• If casual observers respond yes to these questions they will be thanked for their interest and excluded from the study
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Patients

Inclusion Criteria: Patients of the Mayo Clinic Otolaryngology – Head & Neck Surgery department with facial photographs and/or videos. Provide informed consent as described in the IRB protocol.

Exclusion Criteria: Do not provide informed consent as described in the IRB protocol.