Figure 1.

Intervisit agreement of PCD and CDC density. (A) We observed good agreement between visit 1 and visit 2 PCD values using linear units. The solid line represents the mean bias of 1740 cones/mm², and the dashed lines represent the upper (24,000 cones/mm²) and lower (−20,600 cones/mm²) limits of agreement. (B) Good agreement was also observed for PCD values using angular units. The solid line represents the mean bias of 247 cones/deg², and the dashed lines represent the upper (2370 cones/deg²) and lower (−1870 cones/deg²) limits of agreement. (C) Similar results were seen when assessing density at the CDC. We observed good agreement between visit 1 and visit 2 CDC density values using linear units. The solid line represents the mean bias of 895 cones/mm², and the dashed lines represent the upper (27,700 cones/mm²) and lower (−25,900 cones/mm²) limits of agreement. (D) Similar agreement was seen for CDC density values using angular units. The solid line represents the mean bias of 163 cones/deg², and the dashed lines represent the upper (2590 cones/deg²) and lower (−2260 cones/deg²) limits of agreement. Shaded regions represent the 95% CI about the mean bias and the limits of agreement.³⁸ Each individual is indicated by a different symbol; the four filled symbols represent individuals included in Figure 3 and Supplementary Figure S1.