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visuometer
visuometer n. 
/ˈvɪʒʊə(ʊ)miːtə/, /ˌvɪzjʊˈɒmᵻtə/, /ˌvɪʒʊˈɒmᵻtə/, /ˌvɪʒuˈɑmədər/ (see quot. 1847 and cf. visometer n.).
Brit. /ˈvɪzjʊə(ʊ)miːtə/
, /ˈvɪzjʊə(ʊ)miːtə//ˈvɪʒʊə(ʊ)miːtə//ˌvɪzjʊˈɒmᵻtə//ˌvɪʒʊˈɒmᵻtə/U.S. /ˈvɪʒuoʊˌmidər/
, /ˈvɪʒuoʊˌmidər//ˌvɪʒuˈɑmədər/ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments for measuring > [noun] > focal length
visuometer1847
visometer1856
1847 A. Smee Vision in Health & Dis. iii. 37 The adjustment of the exact centre of the glass to the optical centres is so important in practice, that I have contrived an instrument to measure the width accurately between these centres... I have called the instrument itself the visuometer.
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