The 1-Day ACUVUE MOIST Multifocal Brand Contact Lens is a daily disposable soft multifocal contact lens. Most contact lenses correct the patient's nearsighted, farsighted or astigmatic refractive error. In these cases, their distance vision correction is optimized. The unique approach of optimizing an optical design based upon the natural variation that occurs in pupil size across age and refractive error is novel and is addressing a significant unmet need for the presbyopic population. This approach illustrates how by better understanding the anatomical and physiological characteristics of the human eye, we can create more effective designs. The key understanding here was the characterization of the natural variation of the human pupil size over age and refractive power with changes in everyday lighting.