phacometern.

Brit.

/faˈkɒmᵻtə/, U.S.

/fæˈkɑmədər/

Forms: 1800s– phacometer, 1800s– phakometer, 1900s phakometre (irregular).

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: phaco- comb. form, -meter comb. form².

Etymology: < phaco- comb. form + -meter comb. form², after German Phakometer (H. Snellen 1876, in Klin. Monatsblätter f. Augenheilkunde 14 363). Compare French phacomètre (1898 or earlier).

rare.

An instrument for measuring the refractive properties of ophthalmic lenses or of the lens of the eye.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > apparatus > [noun]

spectacle-case1597

steel glass1662

dark glasses1733

bruiser1738

hone pavement1738

Ramsden's ghost1807

sunshade1829

optical bank1874

phacometer1876

optical bench1880

flat1897

lens paper1925

light pipe1939

lens tissue1941

optical fibre1960

1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. (ed. 2) 173 The Phakometer..for the determination of the power of lenses (by the method of placing object and image at equal distances from the lens). Dr. Snellen, Utrecht.

1893 New Sydenham Soc. Lexicon Phacometer, see Phakometer.

1987 Social Stud. Sci. 17 39 (table) Optometry, optometers, phacometers.

1990 Antique Collector May 51/1 (caption) Microscope phakometre [sic]... This 19th century brass instrument serves no useful purpose.

1997 Ophthalmic & Physiol. Optics 17 75 The scheme also avoids the need..to calibrate phakometers with known spherical surfaces where exact relationships are unknown.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	phacometer
释义	phacometern. Brit. /faˈkɒmᵻtə/, U.S. /fæˈkɑmədər/ Forms: 1800s– phacometer, 1800s– phakometer, 1900s phakometre (irregular). Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: phaco- comb. form, -meter comb. form². Etymology: < phaco- comb. form + -meter comb. form², after German Phakometer (H. Snellen 1876, in Klin. Monatsblätter f. Augenheilkunde 14 363). Compare French phacomètre (1898 or earlier). rare. An instrument for measuring the refractive properties of ophthalmic lenses or of the lens of the eye. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > apparatus > [noun] spectacle-case1597 steel glass1662 dark glasses1733 bruiser1738 hone pavement1738 Ramsden's ghost1807 sunshade1829 optical bank1874 phacometer1876 optical bench1880 flat1897 lens paper1925 light pipe1939 lens tissue1941 optical fibre1960 1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. (ed. 2) 173 The Phakometer..for the determination of the power of lenses (by the method of placing object and image at equal distances from the lens). Dr. Snellen, Utrecht. 1893 New Sydenham Soc. Lexicon Phacometer, see Phakometer. 1987 Social Stud. Sci. 17 39 (table) Optometry, optometers, phacometers. 1990 Antique Collector May 51/1 (caption) Microscope phakometre [sic]... This 19th century brass instrument serves no useful purpose. 1997 Ophthalmic & Physiol. Optics 17 75 The scheme also avoids the need..to calibrate phakometers with known spherical surfaces where exact relationships are unknown. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1876
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