• 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.
Chylack LT, Leske MC, Sperduto R, Khu P, McCarthy D. Lens Opacities Classification System. Arch Ophthalmol. 1988;106(3):330-334. doi:10.1001/archopht.1988.01060130356020