While new drug development in the glaucoma field seeks to address the issue of the difficulty patients experience with self-administration of an eye drop by pressing for new drugs that show efficacy in a once daily dosing routine, this strategy has potentially serious negative consequences. Clearly, when glaucoma medications are administered only once a day, if the patient misses their eye on that single instillation, the period of lapsed treatment is 24 hours or more. If their disease worsens, either due to non-compliance with their treatment regimen or inability to instill an eye drop, they will require more follow up visits, additional medications, additional diagnostic tests, and earlier surgery.