Screening of Myopic Photorefractive Keratectomy in Eye Bank Eyes by Computerized Videokeratography

Topographic screening of donor eyes for previous refractive surgery

“…With LASIK, PRK, and RK, correction of myopia results in a central flattening of the anterior corneal surface, which can be seen on topography maps. The first papers consisted of isolated case reports, 4,31-33 animal studies, 4 and in vitro topographic studies after PRK in enucleated eyes. 5 Terry and Ousley 6,7 proposed the first objective techniques to detect refractive surgery in human donor corneas using the Orbscan topography system.…”

“…Although objective screening methods to detect previous refractive surgery in donor eyes have been reported, [4][5][6][7] sensitivity and robustness must be improved. The aim of this study was to develop an objective, user-friendly, rapid, noninvasive, and robust screening tool based on Orbscan (Bausch & Lomb Surgical) corneal topography to detect previous corneal refractive surgery in donor eyes.…”

Transplante de córnea com uso inadvertido de córnea de doador previamente submetido à cirurgia refrativa: relato de caso

“…Além disso, córneas doadoras que tenham sido previamente submetidas à cirurgia refrativa para correção de miopia podem induzir hipermetropia substancial e irregularidades de superfí-cie no olho receptor resultando em astigmatismo irregular e acuidade visual final baixa (9) . No paciente relatado não foi encontrada uma acuidade visual final baixa, pois com uma refração de -0,75 -3,75 x 75°, o paciente chegou a uma visão de 20/40, sendo o seu PAM de 20/40, o que caracterizou uma ambliopia do OE.…”

“…Outros utilizam a videoceratografia computadorizada com o mesmo fim (9) . O ORBSCAN  do paciente, apresentou uma paquimetria muito baixa comparada com a manual.…”

Normative database of donor keratographic readings in an eye-bank setting

“…These donor tissues have an increased risk for post-transplantation mechanical instability and can induce irregular astigmatism or hyperopia in the host eye. 2 Evidence of previous refractive surgery in donor eyes, however, is difficult to detect by standard examination, such as slitlamp biomicroscopy, due to minimal stromal scarring. Alternative nonstandard keratometric techniques are available that may be able to identify such eyes.…”