Mirror-hat device as a drop delivery aid: a pilot study

Can J Ophthalmol. 2014 Aug;49(4):333-8. doi: 10.1016/j.jcjo.2014.04.012.


Objective: To evaluate the effectiveness of a novel mirror-hat drop delivery aid.

Design: Prospective, observational study.

Participants: Sixty eyes from 30 subjects with primary open-angle glaucoma or ocular hypertension attending the glaucoma unit at the Toronto Western Hospital.

Methods: The mirror-hat device consists of a magnifying mirror attached to a brimmed cap. The aid was provided to subjects who self-administered topical antiglaucoma medications. Drop instillation technique (time taken to instill a drop, number of drops dispensed, drop contact location, and contamination of bottle tip) was evaluated with and without the device. Subjects also completed a survey regarding drop administration and satisfaction with the device.

Results: Subjects were less likely to contaminate the bottle tip by touching their eye/eyelid when using the device than without the device (13% vs 37%, respectively, p = 0.02). Twenty-six subjects (86.7%) indicated they could see the drop using the device versus 12 (40%) who reported they saw the drop without the device (p = 0.0005). There were no statistically significant differences in any of the other outcomes. No predictive factors were associated with improved drop administration technique while using the device including uncorrected near-visual acuity, lens status, and glaucoma severity.

Conclusions: Use of the mirror-hat aid is associated with significantly less bottle-tip contamination and better visualization of the drop than without the device; however, the device did not help to reduce time, number of drops, or accuracy when administering eye drops.

Publication types

  • Observational Study

MeSH terms

  • Administration, Ophthalmic
  • Adult
  • Aged
  • Aged, 80 and over
  • Antihypertensive Agents / administration & dosage*
  • Drug Delivery Systems / instrumentation*
  • Drug Packaging*
  • Female
  • Glaucoma, Open-Angle / drug therapy*
  • Humans
  • Intraocular Pressure / drug effects
  • Male
  • Middle Aged
  • Ocular Hypertension / drug therapy
  • Ophthalmic Solutions
  • Pilot Projects
  • Prospective Studies
  • Refraction, Ocular
  • Self Administration
  • Visual Acuity


  • Antihypertensive Agents
  • Ophthalmic Solutions