Editing Pulfrich effect (section)

==Overview==
The effect is generally induced by placing a dark filter over one eye but can also occur spontaneously in several eye diseases such as [[cataract]],<ref>Scotcher SM, Laidlaw DA, Canning CR, Weal MJ, Harrad RA.: ''Pulfrich's phenomenon in unilateral cataract.'', ''Br J Ophthalmol.'', 81(12):1050-5</ref> [[optic neuritis]],<ref>Slagsvold JE: ''Pulfrich pendulum phenomenon in patients with a history of acute optic neuritis.'', ''Acta Ophthalmol (Copenh)'', 6(5):817-26</ref><ref>Burde RM, Gallin PF: ''Visual parameters associated with recovered retrobulbar optic neuritis.'', ''Am J Ophthalmol.'', 79(6):1034-7</ref> or [[multiple sclerosis]].<ref>Rushton D: ''Use of the Pulfrich pendulum for detecting abnormal delay in the visual pathway in multiple sclerosis.'', ''Brain'', 98(2):283-96</ref> In such cases, symptoms such as difficulties judging the paths of oncoming cars have been reported.  The phenomenon is named for German physicist [[Carl Pulfrich]], who first described it in 1922.<ref>{{Cite web|url=http://pulfrich.siu.edu/Pulfrich_Pages/lit_pulf/1922_Pulfrich.htm|title = The Pulfrich Effect: Pulfrich (1922)}}</ref><ref>{{cite journal |doi=10.1080/01658100802590829 |author=Petzold A |title=The Historical Origin of the Pulfrich Effect: A Serendipitous Astronomic Observation at the Border of the Milky Way |journal=Neuro-Ophthalmology |volume=33 |issue=1–2 |pages=39–46 |year=2009|s2cid=15422373 |url=http://discovery.ucl.ac.uk/18957/ }}</ref> [[Carl Pulfrich]] was the brother-in-law of [[Heinrich Hertz]].<ref>{{cite journal |last1=Appleyard |first1=Rollo |title=Pioneers of Electrical Communication--Heinrich Rudolf Hertz--V |journal=Electrical Communication |date=October 1927 |volume=6 |issue=2 |pages=63–77}}</ref> The effect has been exploited as the basis for some television, film, and game 3D presentations.