Lens Opacities Classification System

Arch Ophthalmol. 1988 Mar;106(3):330-4. 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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Cataract / classification*
  • Cataract / pathology
  • Humans
  • Lens Capsule, Crystalline / pathology
  • Lens Cortex, Crystalline / pathology
  • Lens Nucleus, Crystalline / pathology
  • Ophthalmology / methods*
  • Photography