March 1988

Lens Opacities Classification System

Author Affiliations

From Brigham and Women's Hospital, the Massachusetts Eye and Ear Infirmary, and Harvard Medical School, Boston (Drs Chylack and Khu); Division of Epidemiology, Department of Community and Preventive Medicine, State University of New York at Stony Brook (Dr Leske); the Biometry and Epidemiology Program, the National Eye Institute, Bethesda, Md (Dr Sperduto); and the Center for Clinical Cataract Research, Boston (Mr McCarthy).

Arch Ophthalmol. 1988;106(3):330-334. doi:10.1001/archopht.1988.01060130356020

• The Lens Opacities Classification System (LOCS) is a simple system for classifying age-related human lens opacities at the slit lamp or in retroilluminated and slit-lamp photographs. The system employs a set of standard Neitz CTR retroilluminated black-and-white photographs for classification of cortical and posterior subcapsular cataracts and a single color slit-lamp photograph for classification of nuclear color and opalescence. We present a detailed description of the system.