ABSTRACT
We reported an unusual case of choroidal melano-cytoma who was enucleated with diagnosis of retinoblastoma. A 14-month-old boy has been referred to the clinic with compliant of left eye exodeviation for about 10 months. Ocular examination and imaging work-up revealed retinal detachment with a calcified lesion. The patient underwent enucleation of the affected eye with diagnosis of retinoblastoma. Histopathological findings indicated large, polyhedral shape cells of the tumor with small nuclei and abundant cytoplasm filled with melanin granules, suggesting diagnosis of melanocytoma of the choroids and ciliary body. Many cases of the simulation of the malignant melanoma of the choroids and ciliary body with melanocytoma has been reported previously, but melanocytoma resembling as a calcified lesion and retinal detachment with diagnosis of retinoblastoma is a rare condition which has not been reported anywhere.
ABSTRACT
ATM:To determine the tearing angle and tearing force,and effects of associated pressures in tearing of various materials and human lens capsule in continuous curvilinear capsulorhexis(CCC).METHODS:Tearing was done on different materials such as aluminum Iaminated paper,different types of thin transplant plastics and human Iens capsule with blunt tip needle.During the procedure,angle and direction of force were measured.Effects of increased underlying pressure on tearing of tearable materials and effect of anterior chamber depth and vitreous pressure on 24 postmortem hunlan eyes with different ages (range from10 to 75 years),was evaluated.RESULTS:Tearing angle in every material was unique for that material.Angle and force of tearing was decreased reversely with increasing age (from 85 degree in a 10-years-old to 10 degree in older than 50 years).Increasing vitreous pressure and decrease in AC depth causes higher pressure on point of tearing.Safe methods in controlling CCC are discussed jn the context.OONCLUSION:Understanding the physics and vector of forces during CCC is necessary in good performance and avoidance of radial tears.Onange in capsular properties between difierent ages and different type of cataract causes different tearing angle and tearing force that should be considered during CCC.