trifocaladj.n.

/trʌɪˈfəʊkəl/

Etymology: < tri- comb. form + focal adj.

A. adj.

†a. (See quot. 1826) Obsolete.

ΘΚΠ

the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles

steel-rimmeda1400

steelbowed1606

young1667

near-sighted1796

trifocal1826

steel-bow1834

pantoscopic1836

window glass1885

bifocal1888

horn-rimmed1894

pebbled1928

thick-lensed1946

single-vision1962

wire-rim1968

wire-frame1977

Lennon1984

1826 J. I. Hawkins in Repertory Patent Inventions (1827) 3 386 When three pair [of glasses] are worn in one frame..which I denominate trifocal spectacles, the opening should be a circle of one inch diameter.

b. Of a lens: having three parts with different focal lengths. Of spectacles: having such lenses.

ΘΚΠ

the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles > types of spectacle lens

astigmatic1881

toric1890

trifocal1921

multifocal1928

pebble-grained1943

omnifocal1962

1921 Amer. Jrnl. Ophthalmol. 4 406/2 The writer does not claim that every presbyope should have a pair of trifocal spectacles.

1928 S. Duke-Elder Pract. Refraction xxiii. 343 For some purposes tri-focal lenses are advocated.

1969 K. Vonnegut Slaughterhouse-Five v. 93 She was wearing tri-focal lenses in harlequin frames.

B. n.

A trifocal lens; usually plural, trifocal spectacles.

ΘΚΠ

the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [noun] > spectacles > other types of spectacles

half-moon glasses1607

half-moon spectacles1607

blinkers1732

temple-spectacles1762

reading glass1853

distance glasses1864

horn spectacles1893

bifocal1899

trifocal1899

horn-rims1927

harlequin spectacles1940

harlequin glasses1945

library frame1948

aviator1951

library glasses1959

library spectacles1962

multifocals1962

wire-rim1968

1899 J. Thorington Refraction (ed. 3) xi. 283 Trifocals.—Occasionally, a patient is not content with bifocals, but will demand a focal point somewhere between infinity and his working distance.

1946 C. Berens & J. Zuckerman Diagnostic Exam. Eye i. xii. 319 (caption) Double~segment panoptik trifocal for sculptors.

1962 L. S. Sasieni Princ. & Pract. Optical Dispensing vii. 172 Where the gardener does not need a distance correction, the best combination may be reading and weak intermediate. A trifocal is the obvious alternative.

1973 R. Hayes Hungarian Game xxiv. 147 He was a pallid man with eyes that were weirdly distorted by trifocals.

This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2021).

单词	trifocal
释义	trifocaladj.n. /trʌɪˈfəʊkəl/ Etymology: < tri- comb. form + focal adj. A. adj. †a. (See quot. 1826) Obsolete. ΘΚΠ the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles steel-rimmeda1400 steelbowed1606 young1667 near-sighted1796 trifocal1826 steel-bow1834 pantoscopic1836 window glass1885 bifocal1888 horn-rimmed1894 pebbled1928 thick-lensed1946 single-vision1962 wire-rim1968 wire-frame1977 Lennon1984 1826 J. I. Hawkins in Repertory Patent Inventions (1827) 3 386 When three pair [of glasses] are worn in one frame..which I denominate trifocal spectacles, the opening should be a circle of one inch diameter. b. Of a lens: having three parts with different focal lengths. Of spectacles: having such lenses. ΘΚΠ the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles > types of spectacle lens astigmatic1881 toric1890 trifocal1921 multifocal1928 pebble-grained1943 omnifocal1962 1921 Amer. Jrnl. Ophthalmol. 4 406/2 The writer does not claim that every presbyope should have a pair of trifocal spectacles. 1928 S. Duke-Elder Pract. Refraction xxiii. 343 For some purposes tri-focal lenses are advocated. 1969 K. Vonnegut Slaughterhouse-Five v. 93 She was wearing tri-focal lenses in harlequin frames. B. n. A trifocal lens; usually plural, trifocal spectacles. ΘΚΠ the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [noun] > spectacles > other types of spectacles half-moon glasses1607 half-moon spectacles1607 blinkers1732 temple-spectacles1762 reading glass1853 distance glasses1864 horn spectacles1893 bifocal1899 trifocal1899 horn-rims1927 harlequin spectacles1940 harlequin glasses1945 library frame1948 aviator1951 library glasses1959 library spectacles1962 multifocals1962 wire-rim1968 1899 J. Thorington Refraction (ed. 3) xi. 283 Trifocals.—Occasionally, a patient is not content with bifocals, but will demand a focal point somewhere between infinity and his working distance. 1946 C. Berens & J. Zuckerman Diagnostic Exam. Eye i. xii. 319 (caption) Double~segment panoptik trifocal for sculptors. 1962 L. S. Sasieni Princ. & Pract. Optical Dispensing vii. 172 Where the gardener does not need a distance correction, the best combination may be reading and weak intermediate. A trifocal is the obvious alternative. 1973 R. Hayes Hungarian Game xxiv. 147 He was a pallid man with eyes that were weirdly distorted by trifocals. This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2021). < adj.n.1826
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