To the Editor.
—Chylack et al1 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 II." 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
Sparrow JM. Methods of Clinical Cataract Grading: Two Systems Compared. Arch Ophthalmol. 1990;108(9):1209. doi:10.1001/archopht.1990.01070110025006