histopathological study of recepient buttons in penetrating keratoplasty

Forty-five corneal buttons, obtained through penetrating keratoplasty performed during the last one year, were subjects to histopathological examination. Buttons were divided into groups according to preoperative clinical diagnosis. Pathological findings confirmed clinical diagnosis in all cases. Futhermore, histopathology of buttons obtained from scarred corneas, keratoconus, corneal dystrophies, herpetic keratitis, corneal decompensation, corneal blood-staining, disciform keratitis, buphthalmos and a fascinating central corneal dermolipoma, revealed a number of interesting features that may help in a better understanding of corneal disease. In the group of buttons belonging to corneal regrafting, primary tissue failure was detected more commonly [5 out of 9] than allograft rejection [2 out of 9]

Early effect of argon laser trabeculoplasty on human meshwork: an electron microscopic study

An electron microscopic study, using transmission electron microscopy, was performed on trabeculectomy specimens obtained from human phakic eyes scheduled for trabeculectomy for uncontrolled primary open angle glaucoma, few hours to one week after Argon Laser Trabeculoplasty [ALT]. The early results showed disruption of trabecular beams, coagulative necrosis within the beam core, rupture of the endothelial cells covering the beam and heavy dispersion of tissue dibris and pigment granules. The one week specimens showed collagen fiber deposition as well as decrease in tissue debris. The cornea! endothelium nearby the laser site was damaged. No inflammatory cells were seen in any of the specimen examined