Patients with gyrate atrophy may also participate in studies of the effect of vitamin B6 and diet on blood levels of the amino acid ornithine, which is elevated in patients with gyrate atrophy. Participants will take 500 mg of vitamin B6 by mouth every day for 3 to 6 months. If this study confirms a reduction of ornithine levels, then long-term studies of the vitamin as a possible treatment for the disease may be started.