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An Objective Assessment Of The Variability In Number Of Drops Per Bottle Of Glaucoma Medication, Daniel B. Moore, Judy Beck, Richard J. Kryscio

Ophthalmology and Visual Science Faculty Publications

Background: The purpose of this study is to evaluate the number of eyedrops available per bottle of a variety of commonly prescribed glaucoma medications.

Methods: Six bottles of each glaucoma medication were tested: three each in the vertical and horizontal orientations. Bottles were housed in a customized force gauge apparatus designed to mimic ballpoint fingertip contact with a bottle. At a standard rate, all drops were expressed from each bottle and counted with an automated drop counter. Simultaneously, bottle volume was measured and drop size and number were also estimated. The main outcome measures were: total number of drops, volume …