PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 1935131

Computerized method for rotational autokeratoplasty.

I Karpouzas·Y J Pouliquen
View original source ↗Export metadata ↓

Abstract

The aim of our study was to formulate the procedure of rotational autokeratoplasty; that is, design the computer system and software necessary to automatically define the parameters of the problem. To achieve this, we used a CCD camera (Nikon) and a microcomputer with an integrated IMAGENIA (Biocom) interface software card (512 x 512 pixels and 100 gray levels), which permitted acquisition and digitalization of photographs of the lesioned cornea. Digitization of the image allowed us to determine the coordinates (x,y) of the points that lay on the lesion periphery as well as the coordinates of the corneal center; i.e., the geometric center of the cornea. The center of trephination and the optimal diameter of trephination can then be calculated as a function of a point situated on the lesion edge.

Explore related subjects

Corneal TransplantationHumansImage Processing, Computer-AssistedMathematicsMicrocomputersSoftwareTransplantation, AutologousJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

I Karpouzas, Y J Pouliquen. 1991. Computerized method for rotational autokeratoplasty.. https://doi.org/10.1097/00003226-199109000-00001

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2006

How effective is penetrating corneal transplantation? Factors influencing long-term outcome in multivariate analysis.

BACKGROUND: In a large patient cohort, we investigated long-term corneal graft outcome, risk factors for graft failure, and whether corneal graft survival had improved over time. METHODS: Records of 10,952 full-thickness corneal grafts with associated archival follow-up were examined within a prospectively-maintained, national database of 13,831 records, with follow-up extending for up to 18 years. Kaplan-Meier survival analysis was used to indicate variables of interest for Cox proportional hazards regression analysis. A model clustered by individual patient to control for inter-eye or inter-graft dependence was constructed to identify variables best predicting penetrating corneal graft failure. RESULTS: Probability of corneal graft survival was 0.86 at 1 year, 0.73 at 5 years, 0.62 at 10 years, and 0.55 at 15 years. Graft survival did not improve over a 15-year timeframe. Variables predicting graft failure in multivariate analysis included transplant centre, donor age, preoperative diagnosis, number of previous ipsilateral grafts, lens status, history of corneal neovascularisation, ocular inflammation or raised intraocular pressure in the grafted eye, requirement for anterior vitrectomy, graft size, early suture removal, postoperative events including graft neovascularisation, rise in intraocular pressure, and rejection episodes, type of treatment for raised intraocular pressure, and arrangements for recipient follow-up. A further 11 variables showing a significant influence on graft survival in univariate analysis were not included in the final Cox model. CONCLUSION: The long-term results of corneal transplantation are no better than for other forms of transplantation and have shown no measurable improvement over the past 15 years.

Corneal Transplantation↗