The objective of this study is to evaluate the safety and effectiveness of OC-01 (varenicline solution) Nasal Spray as compared to placebo (vehicle) on signs and symptoms of dry eye disease.

Inclusion Criteria:

• Have used and/or desired to use an artificial tear substitute for dry eye symptoms within 6 months prior to the Screening Visit

Exclusion Criteria:

• Have had any intraocular surgery (such as cataract surgery) or extraocular surgery in either eye within three months or refractive surgery (e.g., laser-assisted in-situ keratomileusis, laser epithelial keratomileusis, photorefractive keratectomy or corneal implant) within 12 months of the Screening Visit
• Have a history or presence of any ocular disorder or condition in either eye that would, in the opinion of the Investigator, likely interfere with the interpretation of the study results or participant safety such as significant corneal or conjunctival scarring; pterygium or nodular pinguecula; current ocular infection, acute conjunctivitis, or inflammation not associated with dry eye; anterior (epithelial) basement membrane corneal dystrophy or other clinically significant corneal dystrophy or degeneration; ocular herpetic infection; evidence of keratoconus; etc. Blepharitis not requiring treatment and mild meibomian gland disease that are typically associated with DED are allowed.
• Have a systemic condition or disease not stabilized or judged by the Investigator to be incompatible with participation in the study (e.g., current systemic infection, uncontrolled autoimmune disease, uncontrolled immunodeficiency disease, history of myocardial infarction or heart disease, etc.)
• Have a known hypersensitivity to any of the procedural agents or investigational product components
• Have any condition or history that, in the opinion of the investigator, may interfere with study compliance, outcome measures, safety parameters, and/or the general medical condition of the subject.