Table 1

Retest reliability of visual function questionnaire items, hospital 1

Questionnaire visual function items		Hospital 1, groups 1 and 2 together
Questionnaire visual function items		Number	Spearman correlation	Kappa coefficient
Rating of vision	36	0.96	0.80
Vision hinders usual activity	34	0.86	0.77
Vision hinders recognising people	36	0.93	0.93
Vision hinders reading price labels	36	0.89	0.85
Vision hinders reading magazine	36	0.96	0.86
Vision hinders knitting	37	0.90	0.89
Vision hinders watching TV	36	0.95	0.81
Vision hinders daytime driving	37	0.94	0.81
Vision hinders night-time driving	37	0.92	0.84
Glare hinders usual activities	36	0.93	0.86
Glare hinders reading shiny paper	36	0.93	0.78
Glare hinders driving towards the sun	37	0.98	0.90
Glare hinders walking outside on a sunny day	36	0.97	0.86
Overall average	36.2	0.93	0.84