• A modification to a photo slit-lamp illuminator adds detail to the human optic disc surface by projecting onto it a pattern of fine parallel lines. These stripes curve as they traverse the disc, and its surface contour is revealed. Application of this technique may improve the reliability of methods used to quantitate disc topography.
Cohan BE. Multiple-Slit Illumination of the Optic Disc. Arch Ophthalmol. 1978;96(3):497-500. doi:10.1001/archopht.1978.03910050265015