| abstract |
Method and arrangement for performing measurements of the topography of a surface ( 20 ), such as topography of an eye surface ( 20 ), wherein projecting means ( 1, 12 ) for projecting an image onto said surface ( 20 ) comprises a projection light source ( 1 ), and wherein at least a fraction of light leaving the surface ( 20 ) as a result of said projection is received using one or more receiving units ( 31, 32 ), such as charged coupled device (CCD) based cameras. The topography of the surface ( 20 ) is determined by analysis of said fraction of light leaving the surface ( 20 ), due to thermal emission and the image projected onto the surface ( 20 ) is projected with light comprising a colour for which the surface ( 20 ) is opaque, such as infrared light. |