Keratometry and Computerized Videokeratography in Determining Intraocular Lens Calculation

The most important factor in intraocular lens power calculation is the axial length, followed by the corneal power measurement. In measuring corneal power, conventionally used keratometry evaluates only four indivisual points on the central 3mm of the corneal surface. But coinputerized videokeratography (CVK) is a new technology which maps inside and outside of the central 3mm zone using twenty or seventy hundred data maps. We studied 27 eyes of 26 patients having phacoemulsification and posterior chamber lens implantation. We calculated corneal power using keratometry and CVK. Using the SRK II and Holladay, we obtained intraocular lens power with keratometric value and five values derived. from CVK. 6 weeks later, we evaluated actual postoperative refractive errors and predictive values for each pararneters. Keratometric datas were lower than CVK datas in mean absolute error and standard deviation between actual and predicted postoperative refractive errors and were higher in percentages of cases with power prediction errors < OR =l.0, < OR =2.0 and < OR =3.0 diopters for each formula. And the average keratornetric datas were 0.25mm flatter than CVK. Conventional keratometry may provide more accurate corneal curvature value than the CVK in intraocular lens power calculation.

Introduction of a New Therapeutic Modality for the Chronic Behcets Disease Patients: Synchronization of Plasmapheresis with Immune Modulation Therapy-

The Behcets disease patients with uveitis are oftern suffering from chronic recurrent inflammation resulting in the blindness. Etiology, prognosis, treatment modalities of this disease are various, and the factors, affecting the chronic long term prognosis are not clearly identified. Current treatment for Behcets disease is combination therapy : steroid with colchicine, cyclophosphamide, or cyclosporin. But these kinds of treatment was insufficient to change the disease process and often produced severe complications. Authors treated 4 cases of Behcets patients who had chronic progressive steroid resistent uveitis, with synchronizatin of plasmapheresis and immune modulation therapy. All of them showed marked improvement in uveal inflammatory reaction and visual acuity.

Type IV Ushers Syndrome Manifested by Woman

Ushers syndrome is an autosomal recessively inherited trait that characterized by progressive retinitis pigmentosa combining night blindness with a congenital, nonprogressive sensorineural hearing impairment of variable severity. Speech disorder, vestibular ataxia, mental deficiency, psychosis, and cataract are usually present. We experienced a case of type IV Ushers syndrome in 28 year-old woman that showed the night blindness with decreased visual acuity that had been developed 7-8 years before and congenital sensorineural hearing loss. In fundoscopic examination, characteristic bone corpuscle pigmentation in the periphery, and narrow arteries are found. Her electroretinogram and pure tone audiometric findings show non recordable wave forms and bilateral sensorineural hearing loss. She has mild mental retardation also.