Ocular Motor Score (OMS): a clinical tool to evaluating ocular motor functions in children. Intrarater and inter-rater agreement.
OBJECTIVE
Ocular motor score (OMS) is a new clinical test protocol for evaluating ocular motor functions in children and young adults. OMS is a set of 15 important and relevant non-invasive ocular motor function parameters derived from clinical practice. The aim of the study was to evaluate OMS according to intrarater and inter-rater agreement.


METHODS
Forty children aged 4-10 years, 23 girls median age 6.5 (range 4.3-9.3) and 17 boys median age 5.8 (range 4.1-9.8) were included. The ocular motor functions were assessed and scored according to the OMS protocol. The examinations were videotaped. To obtain the intrarater agreement, the first author examined and scored the children twice, first in the clinic and 2 weeks later by watching the videotape. To obtain the inter-rater agreement, three other raters independently scored the ocular motor function of the children by watching the videotapes.


RESULTS
The overall observed intrarater agreement was 88%, and the observed inter-rater agreement between the three raters was 80%. For none of the subtests was there an observed intrarater agreement lower than 65%. Three of the subtests had an observed inter-rater agreement of 65% or below.


CONCLUSIONS
Overall there was high observed intra- and inter-rater agreement for the OMS test protocol. Subtests such as saccades and smooth pursuit were more difficult for raters to score similarly according the clinical OMS test protocol.
Department of Clinical Neuroscience, Section of Ophthalmology and Vision, Karolinska Institutet, Solna, Sweden.|St. Erik Eye Hospital, Stockholm, Sweden.
Monica
M
Olsson
Department of Clinical Neuroscience, Section of Ophthalmology and Vision, Karolinska Institutet, Solna, Sweden.|Department of Ophthalmology, Vrinnevi Hospital, Norrköping, Sweden.
Kristina
K
Teär Fahnehjelm
Department of Clinical Neuroscience, Section of Ophthalmology and Vision, Karolinska Institutet, Solna, Sweden.|Astrid Lindgren Children's Hospital, Karolinska University Hospital, Solna, Sweden.
Agneta
A
Rydberg
Department of Clinical Neuroscience, Section of Ophthalmology and Vision, Karolinska Institutet, Solna, Sweden.|St. Erik Eye Hospital, Stockholm, Sweden.
Jan
J
Ygge
D002648:Child; D002675:Child, Preschool; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D017120:Nystagmus, Optokinetic / Q000502:physiology; D015588:Observer Variation; D015835:Ocular Motility Disorders / Q000175:diagnosis* / Q000503:physiopathology; D009801:Oculomotor Muscles / Q000502:physiology*; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology; D015203:Reproducibility of Results; D014741:Video Recording
inter-rater agreement; intrarater agreement; observed agreement; ocular motor score