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leucoscope
leucoscope n.
Brit. 
/ˈl(j)uːkə(ʊ)skəʊp/
, /ˈl(j)uːkə(ʊ)skəʊp/U.S. /ˈlukəˌskoʊp/
[-scope comb. form] an instrument contrived by Helmholtz for comparing the relative whiteness of lights or colours, or for testing the power of the eye to distinguish colours./ˈlukəˌskoʊp/ΘΚΠ
the world > health and disease > healing > ophthalmology or optometry > [noun] > instrumental examination or measurement of eye > instruments used in
optometer1738
opsiometer1842
ophthalmoscope1856
auto-ophthalmoscope1863
ophthalmometer1864
phacoidoscope1864
strabismometer1869
autoscope1873
strabometer1874
perimeter1875
leucoscope1883
retinoscope1883
phacoscope1886
phorometer1888
campimeter1889
prisoptometer1890
scotometer1890
skiascope1892
transilluminator1906
slit lamp1922
anomaloscope1923
gonioscope1925
synoptophore1934
1883 Nature 18 Jan. 277/1 Prof. Helmholtz's new instrument, called the leukoscope.
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as lemmas