Safety and Efficacy of Ophthalmic Phentolamine Mesylate to Reverse Pharmacologically Induced Mydriasis

Inclusion Criteria: 1. Males or females ≥ 18 and ≤ 45 years of age with brown irides (irises) only 2. Otherwise healthy and well controlled subjects 3. Able to comply with all protocol mandated procedures and to attend all scheduled office visits 4. Willing to give written informed consent to participate in this study Exclusion Criteria 1. Clinically significant ocular disease as deemed by the Investigator (e.g., cataract, glaucoma, corneal edema, uveitis, severe keratoconjunctivitis sicca) that might interfere with the study 2. Unwilling or unable to discontinue use of contact lenses during treatment visits 3. Ocular trauma, ocular surgery or non-refractive laser treatment within the 6 months prior to screening 4. Ocular medication of any kind within 30 days of screening, with the exception of a) lid scrubs (which may have been used prior to, but not after screening) or b) lubricating drops for dry eye (preservative-free artificial tears), which may be used in between the study treatment days 5. Recent or current evidence of ocular infection or inflammation. Current evidence of clinically significant blepharitis, conjunctivitis, or a history of herpes simplex or herpes zoster keratitis at screening 6. History of diabetic retinopathy 7. Closed or very narrow angles that in the Investigator's opinion are potentially occludable if the subject's pupil is dilated 8. History of any traumatic (surgical or nonsurgical) or non-traumatic condition affecting the pupil or iris (e.g., irregularly shaped pupil, neurogenic pupil disorder, iris atrophy, iridotomy) 9. Known allergy or contraindication to any component of the mydriatic agents or the vehicle formulation 10. Known hypersensitivity or contraindication to α- and/or β-adrenoceptor antagonists (e.g., chronic obstructive pulmonary disease or bronchial asthma; abnormally low blood pressure (BP) or heart rate (HR); second- or third-degree heart blockage or Congestive Heart Failure (CHF); severe diabetes) 11. Clinically significant systemic disease (e.g., uncontrolled diabetes, myasthenia gravis, cancer, hepatic, renal, endocrine or cardiovascular disorders) that might interfere with the study 12. Initiation of treatment with or any changes to the current dosage, drug or regimen of any topical or systemic adrenergic or cholinergic drugs up to 7 days prior to screening, or during the study 13. Participation in any investigational study within 30 days prior to screening 14. Women of childbearing potential who are pregnant, nursing, planning a pregnancy, or not using a medically acceptable form of birth control. Acceptable methods include the use of at least one of the following: intrauterine device (IUD), hormonal (oral, injection, patch, implant, ring), barrier with spermicide (condom, diaphragm), or abstinence. An adult woman is considered to be of childbearing potential unless she is 1 year postmenopausal or 3 months post-surgical sterilization. All females of childbearing potential must have a negative urine pregnancy test result at Visit 1/Screening and Visit 2 examinations and must intend to not become pregnant during the study 15. Resting heart rate (HR) outside the normal range (50-110 beats per minute) at the Screening Visit. HR may be repeated only once if outside the normal range following at least a 5-minute rest period in the sitting position 16. Hypertension with resting diastolic BP \> 105 mmHg or systolic BP \> 160 mmHg at the Screening Visit. BP may be repeated only once if outside the specified range following at least a 5-minute rest period in the sitting position