Optometrists provide most of the vision care needed by those who wear glasses or contact lenses. They examine people’s eyes to detect vision problems and eye diseases, and test for such things as proper depth, color perception, and the ability to focus and coordinate the eyes. Most optometrists work in general practice, but some special in the elderly or children. Others work with partially-sighted persons who use microscopic or telescopic lenses. Still others concern themselves with the visual safety of individual workers or concentrate on contact lenses or vision therapy. Optometrists teach, do research, consult, and serve on health advisory committees of various kinds.