See below. Certain supplements have been shown to help patients with the moderate to severe forms of macular degeneration (vitamin c, vitamin, e, zinc, beta carotene) in the age-related eye disease study (areds). The results of areds2 will be out next year and will answer if lutein, zeaxanthine, and omega-3 fatty acids (dha, epa) help this disease also.
Macular support. Lutein supplements are given as an adjunct for the support of the health of the macula. This is largely theoretical but there is a large nih study underway currently to study this particular substance. Since the fda does not regulate health store supplements, if you feel lutein is of value, get them from a source from a major pharmaceutical company like alcon or bausch and lom.