Normal values with Orbscan IIz corneal topography
Reviewed by Fiona Rowe

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. 

Corneal topography and corneal thickness in children.
Reddy SP, Bansal R, Vaddavalli PK.
JOURNAL OF PEDIATRIC OPHTHALMOLOGY AND STRABISMUS
2013;50:304-10.