Preliminary evaluation of smartphone-based addition measurement in a presbyopic population

Linear regression analysis showed a strong correlation (R² = 0.82) between app-measured and clinical addition values. Bland-Altman analysis revealed a mean over estimation of -0.22± 0.38 D with a limit of agreement of ±0.74 D of the near correction. Cumulative error analysis indicated that 61.7 % of app measurements were within 0.25 D of clinical values, and 82.5 % within 0.50 D CONCLUSIONS: A smartphone-based subjective measurement of presbyopic addition can potentially be used to assess the addition needed to detect the under or over corrected addition in full presbyopic subjects.