5. Posterior examinations: age-related macular degeneration: This study will examine the use of higher frequency (20-30 MHz) ultrasound in the early diagnosis of Age-related macular degeneration. Our hypothesis is that early changes in the choriocapillaries and choroid vascular density and conformation can be detected with high-frequency spectral assays. We will obtain ultrasound scans at frequencies of 20 MHz or more, as well as OCT and fundus photographs. Similar numbers of age-matched control subjects will be examined. Measurements of retinal and choroidal thickness profiles in the peri-macular region will be made. Spectral data will be used for morphologic vascular analysis (size and shape). Statistical comparison will be made using parametric and non-parametric methods between control and AMD groups.