1. A method for making an ophthalmic topography measurement of a target surface including the cornea, the limbus and at least a portion of the adjacent scleral region, comprising: conditioning at least a portion of the target surface such that it diffusely reflects an image projected thereon; projecting a selected image onto a substantial portion of the target surface; obtaining an image of the diffusely reflected image; extracting selected features of the image; and using the extracted features to determine a corneo-scleral surface topography.