Methods of Clinical Cataract Grading: Two Systems Compared

Abstract

To the Editor. —Chylack et al 1 are to be congratulated on the development of the Lens Opacities Classification System II (LOCS II) method. Their pursuit of excellence has been rewarded in a system that is repeatable, and can be applied equally to in vivo clinical slit-lamp grading as well as to the grading of cataract photographs. In their article, the authors compare the LOCS II system with the Oxford Clinical Cataract Classification and Grading System. 2 They make the point that the Oxford system is much more complex than the LOCS This comment is true of the system as a whole, the philosophy behind the design of the system being to provide a composite system for the quantification of a selection of common cataract features, in addition to those major features documented by LOCS II. However, some investigators may prefer to limit themselves to the quantification of major