This study aimed to establish a database of normative measurements of corneal typography in children aged 5-15 years with the Orbscan IIz corneal topography system. They assessed 100 eyes of 100 children. The mean SimK astigmatism was 0.69±0.35D. The maximum and minimum K values were 44.26±1.55 and 43.56±1.57D respectively. Anterior best fit sphere (ABFS) was 7.92±0.26mm and posterior best fit spheres (PBFS) was 6.46±0.24mm with a ratio of ABFS/PBFS of 1.23±0.02. The most common anterior and posterior corneal elevation pattern was the incomplete ridge. The thinnest site on the cornea had an average thickness of 540±34.03um, mostly in the inferotemporal quadrant.
Normal values with Orbscan IIz corneal topography
Reviewed by Fiona Rowe
Corneal topography and corneal thickness in children.
CONTRIBUTOR
Fiona Rowe (Prof)
Institute of Population Health, University of Liverpool, UK.
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