Scotopic pupil size measurement in children
E. M. Schnitzler, A. Zubcov, C. Rosenkranz, T. Kohnen
Purpose: To determine scotopic pupil diameter in a normal pediatric population.
Patients and methods: In 140 eyes of 70 children with a mean age of 6.8 ± 3.4 years (range 2 months 14 years) the scotopic pupil size was measured using the Colvard pupillometer under dim light conditions. Dark adaption was performed for two minutes. The light and handheld Colvard pupillometer designed for refractive surgery purpose uses infrared light and utilizes light amplification technology. Objective refraction (retinoscopy, objective refractometry), visual acuity, age and scotopic pupil diameter were compared with regression analysis.
Results: Mean scotopic pupil diameter was 5.90 ± 0.64 mm (range 4.0 - 7.3). The correlation between the parameter objective refraction, age and scotopic pupil diameter is determined.
Conclusion: From the preliminary results we expect the scotopic pupil diameter in children to be age- and refraction-related.
Dept. of Ophthalmology, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, D 60590 Frankfurt/Main