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idioretinal
idioretinal adj.
Brit. 
/ˌɪdɪə(ʊ)ˈrɛtᵻnl/
, /ˌɪdɪə(ʊ)ˈrɛtᵻnl/U.S. /ˌɪdiəˈrɛtn̩(ə)l/
Psychology designating the faint sensation of light resulting from intrinsic (rather than external) excitation of the retina./ˌɪdiəˈrɛtn̩(ə)l/ΘΚΠ
the world > physical sensation > sight and vision > thing seen > [adjective] > (retained) visual image
homonymous1881
idioretinal1890
positive1899
1890 J. S. Billings National Med. Dict. I. 679/2 Idio-retinal light.
1892 Amer. Jrnl. Psychol. 4 485 In the last case the very faint light they reflect is not sufficient to make them distinguishable from clouds of idio-retinal light.
1938 R. S. Woodworth Exper. Psychol. xxii. 540 The readiest way of experiencing expanse color is to close the eyes and observe the gray field of idioretinal light.
2000 Leonardo 33 307/2 Idioretinal light is..located in front of our eyes and thus could easily be mistaken for perceptions of quantal fluctuations in a room that is not completely light-free.
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