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Leo T. Chylack, Jr, MD; M. Cristina Leske, MD, MPH; Robert Sperduto, MD; Patricia Khu, MD; Daniel McCarthy, COA; the Lens Opacities Case-Control Study Group

Arch Ophthalmol. 1988;106(3):330-334.

Abstract
• 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.

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).

Footnotes
Accepted for publication Oct 6, 1987.

Reprint requests to The Center for Clinical Cataract Research, One Charles Circle, Boston, MA 02114 (Dr Chylack).

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