orthopticadj.n.

1879 Globe Encycl. V. 380/1 They fire a heavier charge of powder with a heavier bullet, and are provided with fine orthoptic and windgauge sights, and shoot with surprising accuracy up to 1200 yards.

1882 Pall Mall Gaz. 15 July 8/2 These competitors were using the orthoptic eye-glasses about which there has recently been so much discussion.

1904 Westm. Gaz. 22 July 10/1 The backsight is provided with an orthoptic aperture through which aim is taken.

1886 C. M. Culver tr. E. Landolt Refraction & Accomm. of Eye v. 407 We may hope to effect a cure of the strabismus by means of orthoptic treatment, with the aid of stereoscopic exercise.

1892 New Sydenham Soc. Lexicon Orthoptic training, a mode of correcting monocular vision produced by strabismus, or other defect, by ocular exercises.

1907 J. H. Parsons Dis. Eye xxviii. 559 If there is any evidence of some degree of binocular vision it may be advisable to attempt to cultivate this by orthoptic treatment.

1932 Brit. Med. Jrnl. 14 May 918/2 The Royal Westminster Ophthalmic Hospital established an orthoptic department..in January, 1930.

1968 H. M. Katzin & G. Wilson Strabismus in Childhood viii. 65 In most patients with crossed eyes orthoptic exercises play a prominent role in treatment.

1989 Brit. Med. Jrnl. 10 June 1581/1 Children with severe amblyopia showed no improvement after orthoptic treatment.

1881 Standard 11 July 3/5 Some disgust has been created amongst the Snider men by a regulation which is to come into force this year prohibiting the use of the ‘orthoptic’.

1882 Pall Mall Gaz. 15 July 8/2 The advantage derived from the use of the orthoptics is that the eyesight is concentrated, and the sights on a rifle or gun are defined with great clearness.

1890 Daily News 27 Jan. 2/5 The use of orthoptics will be forbidden in all competitions in which uniform is ordered to be worn.

1997 Classic Arms & Militaria Mar.–Apr. 23/2 For those of advancing years, whose eyes no longer easily encompass a clear focus on the backsight, the foresight and the target, it is suggested that they use an ‘Orthoptic’ or peep-hole attached to shooting spectacles.

1882 in Athenæum 17 June 769/1 ‘Theory of Orthoptic Loci’, by Rev. Dr. Taylor.

1886 C. Taylor Order of Orthoptic Loci in Messenger of Math. 16 1 The locus..may be called its Orthoptic Locus, since at every point thereof the curve subtends or is seen under a right angle.

1908 Amer. Jrnl. Math. 30 387 The orthoptic locus of the pentatroid is composed of a limaçon and the curve.

1951 Amer. Math. Monthly 58 637 In any triangle the Monge circle (orthoptic locus) of the inscribed conic concentric with the circumcircle is orthogonal to the polar circle.

1945 Brit. Jrnl. Ophthalmol. 29 420 (heading) An analysis of one hundred cases of strabismus treated orthoptically.

1963 Arch. Ophthalmol. 70 117/1 177 cases of accommodative strabismus..had been discharged as orthoptically satisfactory after treatment with glasses or miotics alone, or in combination with orthoptics and surgery.