Usability of an Eye Drop Delivery Aid for Single-Dose Instillation: Results from a Market Research Study

Background: One of the challenges of treating chronic ocular diseases like vernal keratoconjunctivitis (VKC), glaucoma, and ocular surface disease is patient adherence to topical medication. To support correct eye drop instillation, a variety of delivery aids have been developed for both single-dose and conventional multi-dose containers. Methods: To evaluate Dropaid[TM] Single-dose, an eye drop delivery aid designed for single-dose containers, a usability study was conducted on 30 parents and caregivers of patients with VKC. After assessing the ability to squeeze a single eye drop from the singledose container onto the eye of a pediatric medical dummy, the delivery aid was evaluated using an 11-point Likert scale on a variety of characteristics: from "very difficult" (-5) to "very easy" (+5). Results: The majority of participants rated the task of opening the single-dose units (SDUs), preparing, and positioning the Dropaid[TM] Single-dose device as "very easy". When providing a single eye drop from the container, 87% of participants rated the Dropaid[TM] Single-dose device as either "very easy" or "easy", with a median rating score of +5.0 (interquartile range [IQR], 4.0- 5.0). For general ease of use, 84% considered the delivery aid as either "very easy" or "easy", with a median score of +4.0 (IQR, 3.0- 5.0). Most participants (93%) rated Dropaid[TM] Single-dose as either "very comfortable" or "comfortable" to hold, with a median score of +5.0 (IQR, 4.0-5.0). Conclusion: The Dropaid[TM] Single-dose delivery aid demonstrated rapid learning and ease of use across all stages of application, including opening the container, eye drop administration, and handling comfort. Although designed for use with single- dose containers to help eye drop instillation in patients with VKC, Dropaid[TM] Single-dose may provide a wider utility across a range of other ocular diseases such as glaucoma and dry eye. Keywords: Dropaid, eye drop instillation, usability study, vernal keratoconjunctivitis, VKC