الفهرس 
Anatomy of the crystalline lens
Intraocular lens power calculation:Only 14 pages are availabe for public view
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Abstract
Implantation of IOL in children involves several unique challenges not present in adult cataract surgery, as children’s eyes continue to undergo significant growth and change during postoperative years, resulting in refractive changes that complicate the prediction of post-operative refraction and IOL power. Visually significant cataracts may be successfully operated in newborns in order to prevent amblyopia. Careful planning of surgical procedure, selection of IOL and use of appropriate IOL power is a must for pediatric cataract surgery. The most important factor affecting post-operative visual acuity after pediatric cataract surgery is the development of PCO. The aim of the study was to compare the refractive outcome of posterior optic capture versus intra-bagal IOL implantation in pediatric cataract surgery. This prospective, randomized, comparative, and interventional study included 40 eyes of 25 patients with pediatric cataract selected from the outpatient clinic of Ophthalmology department of Tanta University Hospital and completed six months follow up. Good and careful selection of the patients gave good results which included: • Pediatric age group up to 18 years old. • Clear cornea. • Both unilateral and bilateral cases of congenital or developmental cataract were involved. • Traumatic cataract, glaucoma and posterior segment pathology were excluded. Our study showed that there was no statistically significant difference in post-operative refraction between intra-bagal implantation and posterior optic capture of IOL in follow up visits along a period of six months. Also it was noticed that there were no cases with PCO were recorded in children underwent posterior optic capture of IOL. Primary posterior CCC with anterior vitrectomy helped to decrease the incidence of PCO and is particularly useful for pediatric cataract in younger children. Estimation of the ELP was evaluated by UBM under general anesthesia (GA), the difference between the two groups was statistically significant. The limitation of our study is the recurrent use of GA during examination, surgery procedure, UBM, and follow up of post-operative refraction especially in the youngest children. Another limitation was that small number of children and short period of follow up.