measurement of intraocular pressure using schiotz vs tono-pen tonometers in patients with primary congenital glaucoma

purpose: to compare the tono-pen and schiotz tonometers in measurement of intraocular pressure (iop) in patients with primary congenital glaucoma. methods: this study was conducted on 38 eyes of 20 patients with primary congenital glaucoma. all measurements were performed under general anesthesia. one minute after receiving halothane 3% iop was determined by tono-pen and then by schiotz tonometers. data were analyzed by regression analysis and bland-altman bias plot. results: mean age of patients was 19.4±14.5 months and 15 (75%) of them were male. glaucoma was bilateral in 18 (90%) and unilateral in 2 (10%) subjects. mean iop measured by tono-pen and schiotz tonometers was 19.39±8.51 and 18.84±8.9 mmhg, respectively. these tonometers had good concordance in determination of iop in primary congenital glaucoma according to the results of regression analysis and bland-altman bias plot. conclusion: considering the sample size of this study, the tono-pen and schiotz tonometers are highly concordant regarding intraocular pressure measurement in children with primary congenital glaucoma.