Mustafa Onat

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PURPOSE By a retrospective study of patients in the Ankara Hospital Eye Clinic, to determine the anatomical and visual results of therapeutic penetrating keratoplasty (PK) and its role in the management of corneal disease. METHODS Therapeutic PK was performed in 36 patients (37 eyes) who had corneal perforation due to corneal disease (23 eyes) or eyes in(More)
This study reports the outcomes of therapeutic penetrating keratoplasties, defined as keratoplasties performed to eradicate active infectious corneal diseases or to repair a structural defect of the cornea. The records of 24 eyes of 24 patients (17 female and 7 male) treated with therapeutic penetrating keratoplasty between 2002 and 2010 were evaluated(More)
PURPOSE To describe amniotic membrane transplantation indications and results at the authors' institution. METHODS In this study, chart review of 108 patients who underwent amniotic membrane transplantation between January 2002 and April 2006 was performed. The survival rate of corneal integrity was compared, using Kaplan-Meier survival analysis, as a(More)
PURPOSE To evaluate the data of penetrating keratoplasty over a 10-year period and to compare indications and outcomes of eyes undergoing single graft with those of eyes requiring regrafting. METHODS A total of 652 eyes of 613 patients required single graft (Group I). Sixty-one regrafts were performed on 53 eyes (Group II). The mean follow-up time was(More)
PURPOSE To investigate the prevalence of microbial keratitis, predisposing risk factors and treatment modalities in patients who developed keratitis following penetrating keratoplasty (PK). PATIENTS AND METHODS The records of 285 patients who had undergone PK between January 1991 and December 1995 in a tertiary care center were reviewed. Patients who(More)
Cellular Neural Networks (CNN) having parallel processing capabilities present important advantages in image processing applications. The coefficients of the template matrices and the threshold values of CNN should be optimized to obtain the desired output image. The learning algorithms designed for classical feed forward neural networks are not suitable(More)
Combining all image pieces which are randomly scattered to reconstruct the initial (original) image takes so much time. For instance, combining the all image pieces used in tiling is a tedious and time consuming task. For this purpose, the hardness of the task is able to be decreased and the task duration is able to be shortened using the developed image(More)
PURPOSE To determine the outcomes of a modified amniotic membrane transplantation (AMT) suturing technique for pain and discomfort relief in patients with symptomatic bullous keratopathy (BK). DESIGN Randomized, double-blind controlled clinical trial. METHODS setting: Ankara Research and Training Hospital 1st and 2nd Eye Clinics, Ankara, Turkey. study(More)