The Study Evaluating the Efficacy and Safety of OK-101 in Subjects With Dry Eye Disease

Subjects eligible to be randomized will receive either OK-101 or placebo to be administered bilaterally twice daily (BID) for 12 weeks (from Visit 2 to Visit 5). During a 14-day study run-in period (for the purpose of subject selection) prior to randomization, all subjects will receive Placebo Ophthalmic Solution (vehicle) bilaterally BID.

Inclusion criteria

• Be at least 18 years of age;
• Provide written informed consent;
• Be willing and able to comply with all study procedures;
• Have a patient-reported history of dry eye for at least 6 months prior to Visit 1;
• Have a history of use or desire to use eye drops for dry eye symptoms within 6 months of Visit 1;
• Have a best corrected visual acuity (BCVA) of 0.7 logarithm of the minimum angle of resolution (logMAR) or better (Snellen equivalent score of 20/100 or better) in each eye at Visit 1;
• Report a score of ≥ 2 according to the Ora Calibra® Ocular Discomfort & 4-Symptom Questionnaire in at least one of the dry eye symptoms at Visits 1 and 2;
• Have a Schirmer's Test score of ≤ 10 mm and ≥ 1 mm at Visits 1 and 2;
• Have a corneal fluorescein staining score of ≥ 2 in at least one region according to the Ora Calibra® Corneal and Conjunctival Staining Scale for Grading of Fluorescein Staining in at least one region in one eye at Visits 1 and 2 and a central score ≥ 1 in the same eye;
• Have a total lissamine green conjunctival score of ≥ 2, based on the sum of the temporal and nasal regions pre-CAE® at Visits 1 and 2;
• Have a conjunctival redness score ≥ 1 according to the Ora Calibra® Conjunctival Redness for Dry Eye Scale in at least one eye at Visits 1 and 2 pre- CAE;
• Demonstrate in the same eye(s) a response to the CAE at Visits 1 and 2 as defined by:

• Having at least a ≥1 point increase in fluorescein staining in the inferior region in at least one eye following CAE® exposure;
• Reporting an Ocular Discomfort score ≥3 at 2 or more consecutive time points in at least one eye during CAE® exposure (if a subject has an Ocular Discomfort rating of 3 at time = 0 for an eye, s/he must report an Ocular Discomfort rating of 4 for two consecutive measurements for that eye). Note: a subject cannot have an Ocular Discomfort score of 4 at time = 0);
• Have at least one eye, the same eye, satisfy all criteria for 8, 9, 10, 11 and 12 above;
• A negative urine pregnancy test if female of childbearing potential (those who are not surgically sterilized [bilateral tubal ligation, hysterectomy or bilateral oophorectomy] or post- menopausal [12 months after last menses]) and must use adequate birth control through the study period. For non-sexually active females, abstinence may be regarded as an adequate method of birth control.

Exclusion criteria

• Have any clinically significant slit lamp findings at Visit 1 that may include active blepharitis, meibomian gland dysfunction, ocular rosacea, lid margin inflammation, or active ocular allergies that require therapeutic treatment, or currently using tetracyclines (e.g., doxycycline, minocycline, tetracycline) and/or in the opinion of the investigator may interfere with study parameters;
• Be diagnosed with an ongoing ocular infection (bacterial, viral, or fungal), or active ocular inflammation at Visit 1;
• Have worn contact lenses within 7 days of Visit 1 or anticipate using contact lenses during the study;
• Have previously had laser-assisted in situ keratomileusis (LASIK) surgery, Photorefractive keratectomy (PRK), or small incision lenticule extraction (SMILE) within the last 12 months;
• Have used Restasis®, Xiidra®, Cequa®, Tyrvaya®, serum tears, generic cyclosporine A, and EYSUVIS® within 30 days of Visit 1;
• Have had any ocular and/or lid surgeries in the past 6 months or have any planned ocular and/or lid surgeries over the study period;
• Any use of Lipiflow, thermopulsation, Meibomian gland expression or intense pulsed light treatment within 6 months of visit 1
• Be using or anticipate using temporary punctal plugs during the study that have not been stable within 30 days of Visit 1 or have permanent punctal plugs or had surgical punctal occlusion;
• Be currently taking any topical ophthalmic prescription (including medications for glaucoma) or over-the-counter solutions, artificial tears, gels or scrubs, and cannot discontinue these medications for the duration of the trial (excluding medications allowed for the conduct of the study); the respective wash-out periods are required for the following medications:

• Antihistamines (including ocular): 72 hours prior to Visit 1
• Oral aspirin or aspirin-containing products allowed if dose has been stable over past 30 days prior to Visit 1 and no change in dose is anticipated during the study period
• Corticosteroids or mast cell stabilizers (including ocular): 14 days prior to Visit 1
• Any medication (oral or topical) known to cause ocular drying that has not been administered as a stable dose for at least 30 days prior to Visit 1 and during the study
• Neurostimulators: 30 days prior to Visit 1
• Current use or planned use of Prokera® during study conduct or within 30 days prior to Visit 1
• All other topical ophthalmic preparations (including artificial tear substitutes) other than the study drops: 72 hours prior to Visit 1
• Have an uncontrolled systemic disease;
• Be a woman who is pregnant, nursing, or planning a pregnancy;
• Be unwilling to submit a urine pregnancy test at Visit 1 and Visit 6 (or early termination visit) if of childbearing potential. Non-childbearing potential is defined as a woman who is permanently sterilized (e.g., has had a hysterectomy or tubal ligation), or is postmenopausal (without menses for 12 consecutive months);
• Be a woman of childbearing potential who is not using an acceptable means of birth control; acceptable methods of contraception include: hormonal - oral, implantable, injectable, or transdermal contraceptives; mechanical - spermicide in conjunction with a barrier such as a diaphragm or condom; intrauterine device; or surgical sterilization of partner. For non-sexually active females, abstinence may be regarded as an adequate method of birth control; however, if the subject becomes sexually active during the study, she must agree to use adequate birth control as defined above for the remainder of the study;
• Have a known allergy and/or sensitivity to the test article or its components;
• Have a condition or be in a situation which the investigator feels may put the subject at significant risk, may confound the study results, or may interfere significantly with the subject's participation in the study;
• Be currently enrolled in an investigational drug or device study or have used an investigational drug or device within 30 days of Visit 1;