Original articleCorneal Hysteresis and Intraocular Pressure Measurement in Children Using the Reichert Ocular Response Analyzer
Section snippets
Methods
This study was granted approval by the Institutional Review Board of the Childrens University Hospital, Dublin, Ireland. Children ranging in age from four to 18 years attending a pediatric ophthalmology clinic were selected for inclusion in the study. These children had healthy corneas and no history of anterior segment surgery. A second group of children with congenital glaucoma was also selected for inclusion. Goniotomy had previously been carried out on all eyes and was the sole surgical
Results
Corneal hysteresis was measured in 91 normal eyes of 42 children (22 boys, 20 girls) ranging in age from four to 18 years. Mean recorded corneal hysteresis was 12.5 ± 1.35 mm Hg (range, 8.2 to 15.7 mm Hg) (Figure). No correlation was found between corneal hysteresis and age (r = −0.08). Mean corneal hysteresis in 11 eyes of eight children with congenital glaucoma was 6.3 ± 1.58 mm Hg (range, 3.1 to 8.5 mm Hg) (Figure). Lowest corneal hysteresis values were recorded from eyes observed clinically
Discussion
Recent advances in technology have enabled in vivo measurement of corneal biomechanics, with the result that this is now the focus of much research interest. RORA has the capability to measure both corneal hysteresis and IOP simultaneously. A jet of air directed at the cornea generates a force-displacement relationship, which is monitored by an electrooptical system. The underlying principles have been described by Luce.1 During a measurement, a precise jet of air is directed at the cornea that
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