What's the difference between dioptre and dioptry?
Dioptre
Definition:
(n.) A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
Example Sentences:
(1) In terms of the various keratometry values compared, mean K (corneal refractive power), flattest K, steepest K, astigmatism and the axis of astigmatism, 65% to 75% of the cases on automated keratometry were within 0.26 dioptres or 11 degrees of manually determined values; the difference was statistically significant (p < 0.001).
(2) The average increases in tonic accommodation and tonic vergence following reading were 0.35 dioptres and 0.38 metre angles, respectively.
(3) Residual refractive error was highly unpredictable, but did not exceed 6 dioptres.
(4) The centre of the subretinal depositis, and therefore the highest point of retinal detachment (3 dioptres), appears white.
(5) All concentrations of thymoxamine increased the accommodative amplitude by about 1.5 dioptres.
(6) At birth agreement between the two refractionists to within 1 dioptre spherical equivalent was 82%, rising to 94% at 1 year.
(7) Refraction showed 61.3% to be within 1 dioptre of emmetropia and 86.7% were within 2 dioptres.
(8) Accommodation decreased by about 0.5 dioptre after instillation of 5 x 5 microliter 10% phenylephrine.
(9) The author presents 31 cases of unilateral high myopic children up to age 12 with anisometropia between 4 and 19 dioptres.
(10) Biomicroscopical examination of the vitreous and peripheral retina was performed on 103 aphakic eyes with myopia of at least -6-0 dioptres.
(11) In forming a special contact lens for use in cases of keratoconus, the centre the curves vary from 7.2 mm (47 dioptres) to 5.6 mm (60 dioptres), and at the periphery the curve is a constant 7.65 mm (44 dioptres) in all lenses.
(12) Two patients had residual deviations: one child with 30 prism dioptres of residual esotropia had 400 arc seconds and the remaining patient, with 12 prism dioptres of exotropia and marked anisometropia, did not show stereopsis.
(13) One-third of patients in the latter age group, with symptoms, have a value of 3 prism dioptres or more whilst it is rare to find an asymptomatic patient with a value as large as this.
(14) However, measurements made with light restricted to the short end of the visible spectrum indicate only one or two dioptres of hyperopia and it is possible that the latter measurements are more coincident with natural conditions.
(15) The authors obtained a reduction of the refraction error of about 5 dioptres, in individual cases the astigmatism was also corrected with a good result.
(16) In photopic conditions one prism-dioptre causes a significant drop in sensitivity at all spatial frequencies and in mesopic conditions as little as a half prism-dioptre has a similar effect.
(17) Anisometropia is not significantly associated with esotropia (P = 0-31) unless there is spherical hypermetropia of +2-00 dioptres or more in the more emmetropic eye (P less than 0-001).
(18) More accurate results were obtained when the intraocular lenses were used in one dioptre steps.
(19) Appropriate use of base-out prisms may be useful objective test for detecting persistence of normal binocular vision (4-dioptre prism test).
(20) Three of the 16 had greater than 12 prism dioptres of esotropia, and none were exotropic.
Dioptry
Definition:
(n.) A dioptre.
Example Sentences:
(1) Oculomotor visual input of the postural system can be modified with a small powerful prism from 1 to 4 dioptries.
(2) Medium astigmatism was 3 dioptries, always regular.
(3) 28 patients with high myopia (over-10 dioptries) were implanted in anterior chamber with a myopic IOL.
(4) The accommodation diminished from 6 to 2 dioptries in patients, and from 8 to 5 dioptries in controls.
(5) It's necessary to take a color slide of the optic nerve head (Kodachrome 64 asa, angle 45 degrees) and measure parameters on the patient (length in mm of the flashed slit on the optic nerve head with the slotted light and Goldmann lens, the measurement in dioptries of the ametropia and the radius in mm of the anterior surface of the cornea).