Phenylephrine Versus Eyelid Taping for Muller's Muscle-Conjunctival Resection (MMCR) Evaluation

Inclusion Criteria: * Individuals diagnosed with ptosis undergoing conjunctival Muller's muscle resection evaluation. * Individuals who can tolerate and have no hypersensitivity to phenylephrine 2.5% ophthalmic solution. * Individuals who can tolerate eye-drop medications. * Individuals who are physically able to take a tangent screen visual field test. * Age: Adults who can comprehend the instructions and procedures (18+ years old) Exclusion Criteria: \- This study will not incorporate any of the following at-risk populations: adults unable to consent, individuals who are not yet adults, pregnant women, prisoners. * This study will not include participants who refuse to consent. * This study will not include participants who are too tired or unable to take a tangent screen visual field test (see Risk to Subjects). * This study will not include individuals who may not be able to tolerate phenylephrine 2.5% ophthalmic solution. * Specifically, those with a past medical history of bradycardia, hypotension, autonomic dysfunction, or severe cardiovascular disease * This study will not include individuals who consume drugs contraindicated in phenylephrine use: Ergot Derivatives (Vasoconstrictive CYP3A4 Substrates), Iobenguane Radiopharmaceutical Products, Kratom, Lisuride, Monoamine Oxidase Inhibitors