Table 2 Coefficient of repeatability for contrast sensitivity measurement with the Pelli–Robson chart.

Study	Coefficient of repeatability (Pelli–Robson chart)
This study	0.182
Dougherty, et al18	0.20, Low vision
	0.18, Older controls
	0.14, Young controls
Elliot et al21	0.20
Elliott et al24	0.16, Young controls
	0.23, Older controls
Lovie–Kitchin and Brown25	0.17, Controls
Elliot and Bullimore26	0.18, Controls and people with cataract
Haymes et al19	0.18, Controls