Ultrasound findings in Terson's syndrome: two case reports.

Terson's syndrome describes the concurrence of intracranial hemorrhage, vitreous hemorrhage and juxtapapillary subinternal limiting membrane and retinal hemorrhage. In most cases, the retinal and vitreous hemorrhage will clear spontaneously. Vitrectomy was indicated by persistent hemorrhage in two cases. Ultrasound was used to follow up the changes including premacular hemorrhage that appeared as a dome-shaped, smooth, mildly elevated, immobile membrane overlying the posterior pole. This membrane which represents the posterior hyaloid or internal limiting membrane is usually highly reflective due to the submembranous blood adherent to its posterior surface. Consequently, it may mimic localized detachment of the posterior pole. Differentiation from retinal detachment can usually be made by considering the history and other clinical findings. The clinical manifestations of Terson's syndrome, correlated well with the ultrasound findings until vitrectomy was done.

Comparative analysis of intraocular lens power calculation methods after excimer laser surgery.

Many methods have been used in an attempt to more accurate predict the intraocular lens (IOL) power in the eyes undergoing refractive surgery, but none has proved most accurate. The aim of this study was to evaluate the accuracy and predictability of different IOL power calculation methods in eyes after excimer laser surgery. The outcomes of phacoemulsification and IOL implantation in 18 eyes of 16 patients with prior excimer laser keratectomy were documented. The lowest error was achieved using history-derived method. The refractive results of IOL implantation using the same biometry data in eyes after excimer laser surgery can vary markedly. In the present study, the SRK-T formula resulted in highest accuracy.