An inter-observer and intra-observer study of a classification of RetCam images of retinal haemorrhages in children

Alan O. Mulvihill, Patricia Jones, Anamika Tandon, Brian W. Fleck, Robert A. Minns

Research output: Contribution to journalArticlepeer-review


Background There is currently no universally accepted classification of childhood retinal haemorrhages.

Aim To measure the inter- and intra-observer agreement of clinical classifications of retinal haemorrhages in children.

Methods Four examiners (two consultant ophthalmologists and two other clinicians) were shown 142 retinal haemorrhages on 31 RetCam photographs. The retinal haemorrhages were from children with accidental or abusive head injury, or other encephalopathies, and included retinal haemorrhages of different ages. Specified haemorrhages were initially classified by each examiner according to their clinical understanding. Altogether, 26 haemorrhages were represented to test intra-observer consistency. Examiners then agreed a common description for each haemorrhage type and five categories were described (vitreous, pre-retinal, nerve fibre layer, intra-retinal/sub-retinal or indeterminate) and the study repeated.

Results There was 'fair agreement' initially (Fleiss' unweighted kappa = 0.219) and, with the agreed classification, slight improvement (0.356). Intra-observer agreement marginally improved on re-test. The two consultant ophthalmologists showed 'fair' agreement on both occasions (paired kappa statistic). The other rater pair improved from 'fair' to 'substantial' agreement with the new classification.

Conclusions The classification of retinal haemorrhage in children by appearance alone shows only fair agreement between examiners. Clinicians who are not consultant ophthalmologists appear to benefit from the new succinct classification.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalBritish Journal of Ophthalmology
Issue number1
Publication statusPublished - Jan 2011

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