Table 2. Frequency distribution of visual acuities amongst Standard 6-m Snellen visual acuity (6SVA) and iPhone Snellen visual acuity (iSVA).

Group	n	Mean 6SVA in LogMAR	Mean iSVA in LogMAR	Mean difference in LogMAR (Limits of Agreement) Limits of Agreement=mean difference ±1.96 × SD of the differences
≤6/6	22	−0.051	0.041	−0.10 (−0.22, 0.20)
>6/6 to ≤6/9	28	0.138	0.210	−0.071 (−0.37, 0.23)
>6/9 to ≤6/12	18	0.250	0.217	0.034 (−0.27, 0.34)
>6/12 to ≤6/18	15	0.386	0.253	0.132 (−0.25, 0.51)
>6/18	5	0.559	0.283	0.276 (−0.06, 0.61)
Overall	88	0.180	0.160	0.02 (−0.332, 0.372)

This column represents the average rating, and number of ratings received for each application.