A usability study shows the habit is learnable, while the accuracy question stays open.
Between eye appointments, most people with myopia have no idea whether their vision has changed. The prescription in their glasses is either right or it is not, and the only way to find out has been to book another visit. A TELKOMNIKA paper explored what happens when that check becomes something a phone can attempt.
The standard tools for measuring refractive error are a phoropter used with a Snellen chart, and retinoscopy. Both are accurate and both require an operator with training. That combination keeps measurement inside the clinic and out of daily life, which delays the point at which someone notices their myopia is progressing.
Five participants with normal vision, myopia without glasses, and myopia with glasses used the Android prototype. Everyone completed the sequence of seven tasks, with a success rate of 100 percent and an average time of 2.03 minutes. The usability score of 80.5 places the app in the usable band. Measuring at home, in other words, is something people can be taught to do quickly.
The item that scored lowest in the questionnaire, at 2.20 out of 5, asked whether the app's result matched the participant's actual condition. Some participants saw a different value than their real prescription. The authors are direct that accuracy was out of scope, describing the work as an early stage usability evaluation rather than a validation study.
The value of the idea is the direction it points at: cheap, frequent, self directed tracking that tells someone when it is time to book a real examination.
Komang Candra Brata and Mukhammad Sharif Hidayatulloh (2019). An idea of intuitive mobile diopter calculator for myopia patient. TELKOMNIKA (Telecommunication Computing Electronics and Control).
