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Asmaa M Shuaib, Abdelrahman M Elhusseiny, Dina H Hassanein, Rasha H Zedan, Hala M Elhilali Faculty of Medicine, Cairo University, Cairo, EgyptCorrespondence: Abdelrahman M ElhusseinyDepartment of Ophthalmology, Cairo University Faculty of Medicine, Cairo, EgyptEmail Abdelrhman.elhussieny@gmail.comPurpose: To compare the accuracy of IOL power calculation formulae in a large cohort of children who underwent IOL implantation.Setting: Cairo University Children Hospital.Design: Retrospective, case series.Methods: A retrospective chart review of all children < 14 years, who underwent primary or secondary IOL implantation in Cairo University Children Hospital from January 2016 to December 2019, was performed. Absolute prediction error (APE) was calculated for SRKII, SRK/T, Holladay I and Hoffer-Q formulae using the patients’ AL, keratometric (K) readings, implanted IOL power and refraction done two months postoperatively.Results: The study included 308 eyes of 255 patients with a mean age of 4.74 ± 3.19 years at the time of surgery. The mean K-reading was 43.42 ± 3.57 diopters (D) and mean AL was 22.01 ± 1.93 mm. The percentage of eyes with APE within 0.5D was 27.7% (85 eyes), 32.2% (99 eyes), 30.6% (94 eyes) and 25.4% (78 eyes) with SRK II, SRK/T, Holladay I and Hoffer-Q formulae, respectively. APE was significantly lower with the SRK/T formula (P≤ 0.004) and significantly higher with the Hoffer-Q formula (P≤ 0.002). There was a negative correlation between the age of the patient and the APE of the SRK II formula (P=0.02). Moreover, the SRK/T, Holladay and Hoffer-Q formulae APEs were affected by the average k-readings (P=0.019, 0.005 and 0.035) respectively.Conclusion: The SRK/T and Holladay I formulae were the most predictable formulae in IOL power calculation in pediatric eyes.Keywords: intraocular lens, biometry formula, keratometric readings, axial length

Nancy Abdel Salam Gomaa,1 Youssef AH Helmy,2 Sara Maher,2 Dina Hassanein,2 Asmaa Shuaib,2 Ahmed I Hegazy,2 Aliaa A Ali1 1Department of Pediatrics, Faculty of Medicine, Cairo University, Cairo, Egypt; 2Department of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, EgyptCorrespondence: Aliaa A AliDepartment of Pediatrics, Faculty of Medicine, Cairo University, Cairo University Specialized Pediatric Hospital, 1 Ali Basha Ibrahim Street, Giza, Cairo, 11562, EgyptTel +201001115611Email draliaaadel@yahoo.comPurpose: We aimed to identify the risk factors that may predispose preterm neonates to develop aggressive posterior retinopathy of prematurity (APROP).Methods: This retrospective case control study included 16 infants with APROP in zone 1 or posterior zone 2. Thirty-four gestational age and birth weight-matched controls with stage 2 or less ROP were included. We reviewed medical records on infant birth and postnatal characteristics.Results: Patients who developed APROP had a significantly longer duration of caffeine therapy, were significantly more likely to be small for gestational age (SGA), and were more likely to have a positive blood culture than patients who developed less severe ROP. Patients with APROP who required retreatment had received inotropes for a longer duration of time, had received more plasma transfusions, were more likely to have IVH, and had a greater decrease in the serum hemoglobin during hospitalization.Conclusion: Being SGA, receiving caffeine for a longer duration, and having culture-proven sepsis were associated with APROP. IVH, a low serum hemoglobin, the need for more plasma transfusions, and a longer duration of inotropes were associated with APROP which required retreatment.Keywords: aggressive posterior retinopathy of prematurity, caffeine, dopamine, preterm neonate, small for gestational age