الفهرس | Only 14 pages are availabe for public view |
Abstract Capsular opacification is a major problem that faces cataract surgeons and affects the resultant visual acuity (VA). Quantification of capsule opacification is essential to evaluate the new preventive methods of PCO and allows timely intervention with YAG laser capsulotomy. The ideal system of evaluation should be objective, easy to perform, have minimal bias and produce a quantifiable PCO value that correlates well with VA changes. Different qualitative and quantitative methods of PCO evaluation have been reported. Qualitative methods, such as slit lamp grading evaluation and fundus visualization, can illustrate PCO but are subjective and have difficulty calculating PCO evolution. Different techniques have been adopted for capsule imaging including Scheimpflug system, Optical Coherence Tomography and digital imaging. Digital image acquisition is particularly suited to the study of the PCO.83 The analysis of retroillumination images presents unique problems. Fusion of digital retroillumination images with the current versions of softwares provided highly satisfactory results when a coaxial illumination system was used. Recently, new methods of PCO quantitative evaluation have been reported. They include brightness based analysis, computerized analysis of densityboundaries, density map system, texture analysis system and color-coded grid system. No one system can be considered a gold standard, and each has advantages and disadvantages. Yet, Texture analysis is regarded to be the nearest to a fully objective system for analysis |