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Neurosensory Abnormalities in SymptomAtic Ocular Surface Patients (NASA)

Dry eyes
All genders
person-wave 21+
Recruiting now


Principal Investigator: Pedram Hamrah, MD
  • To establish the prevalence of neuropathic corneal pain in patients with ocular surface discomfort.
  • To assess the overlap of neuropathic corneal pain with dry eye disease in patients in diseases that are currently thought to be mutually exclusive.
  • To establish the prevalence of subtypes of patients with neuropathic corneal pain or with a neuropathic component of dry eye in patients with ocular surface discomfort.

Study details

Inclusion Criteria
  • Presents with ocular surface discomfort or for dry eye care
  • Best corrected visual acuity of 20/40 or better in each eye
  • Subject reported duration of symptoms of at least 3 months
Exclusion Criteria
  • Use of contact lenses on the day of the visit
  • Pregnant or nursing
  • Irregular corneas (e.g., ectatic disease, transplantation, or corneal dystrophies)
Study Requirements

One visit

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