In 1910, Otmar Purtscher described bilateral segmental whitening in the retinas of a middle-aged man who fell from a tree and suffered head trauma. Today the term “Purtscher's retinopathy” is used to describe retinal disorders seen after trauma.
Purtscher's and Purtscher's-like Retinopathy (PuR) are rare; collectively, their estimated incidence is 0.24 persons per million per year. Sixty percent of cases present with bilateral involvement.
The findings of Purtscher's and Purtscher's-like retinopathy include cotton wool spots (93% of cases), intraretinal hemorrhages (65%) and Purtcher's Flecken (present in 63% of cases, but thought to be pathognomonic for this condition). Purtscher's Flecken are well-defined white lesions that are separated from precapillary arterioles, arterioles, and venules by a clear 50μm space on either side of the vessel. Cotton-wool spots do not have this clear zone, may be located superficially over the vessels, and are ill-defined.