Table 2. Trichotomous analysis of inter-rater agreement scores for the three categories of not sight impaired, sight impaired, and severely sight impaired.

Sample	Kappa	95% CI	Alpha (ordinal)	95% CI	ICC	95% CI
Overall	0.160	0.101–0.252	0.295	0.167–0.415	0.307	0.212–0.446
Glaucoma	0.226	0.146–0.369	0.386	0.269–0.495	0.399	0.278–0.552
Experienced	0.193	0.118–0.292	0.207	0.065–0.336	0.323	0.133–0.373