Flicker Fusion Thresholds Between Young and Old Subjects at Various Luminance Levels

Inclusion Criteria: * Provide written and informed consent; * Be willing and able to follow all instructions and attend the study visit; * Must be able to successfully complete all study procedures; * If female and of childbearing potential, not be pregnant, nursing, or planning a pregnancy and be willing to submit a pregnancy test at Visit 1 (and exit visit as applicable) and utilize an acceptable form of birth control for the duration of the study; * Be 18 years of age or older * Have best-corrected distance visual acuity (BCVA) of better or equal to 20/30 in at least one eye at Visit 1; * Have best-corrected near visual acuity of better or equal to 20/30 in at least one eye at Visit 1; * Have visited an ophthalmologist for an eye exam within 1 year of Visit 1; Exclusion Criteria: * Have a history of age-related macular degeneration (exudative and non-exudative), diabetic retinopathy, retinal detachment, or any chronic retinopathy or retinal degenerative disease; * Have had prior retinal vein or artery occlusion, history of macular edema, or optic neuropathy; * Have a history of glaucoma or ocular hypertension * Have visually significant cataracts at Visit 1; * Have a history of ocular trauma; * Have a history of photophobia reported at Visit 1; * Report ocular discomfort of 2 or greater in either eye at Visit 1, or report any other ocular symptomatology that could in the opinion of the investigator interfere with study procedures; * Have active signs or symptoms of conj…