The Effect of Eyedrop Size on Pupillary Dilation Using the Nanodropper Bottle Adapter

The average drop size produced by standard eyedrop bottle exceeds the maximal capacity that the human eye are absorb topically. This excess leads to medication waste, increased costs, and greater risk of side effects. The Nanodropper is a commercially available, FDA listed eyedrop bottle adapter that delivers a smaller drop size. The investigators hypothesize the Nanodropper is noninferior to the standard eye drop bottle for pupil dilation. In this study, participants have one eye randomly chosen to be dilated with the Nanodropper and the fellow eye dilated with the standard bottle with a 50/50 mixture of tropicamide 1% and phenylephrine 2.5%. Pupil size before and after 30 minutes of dilation are measured with a pupillometer and compared between fellow eyes to see if there is a difference.