Fig. 46. Arcus senilis. A. Lipid is concentrated in the anterior and posterior stroma as two triangles, apex to apex, with bases at Bowman's (b) and Descemet's (d) membranes, both infiltrated heavily by fat. Arcus senilis in an autopsied eye is shown in inset. C. Lipid deposits in two planes of Descemet's membrane. Inset shows dual lines (arrows) of lipid infiltration in Descemet's membrane. (Courtesy of SEI Photoarchives.) (Modified from Fine BS, Townsend WH, Zimmerman LE et al: Primary lipoidal degeneration of the cornea. Am J Ophthalmol 78:12, 1974.)