dioptre

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dioptre

(US), diopter
a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres
References in periodicals archive ?
Both male and female patients undergoing cataract surgery with a minimum pre-operative astigmatism of 0.5 diopters (D) were included.
There were no significant differences between the two groups in the postoperative parameters including the visual acuity (P = 0.388, Table 2), refractive error (P = 0.955), amount of astigmatism (P = 0.689), and IOP (p = 0.529) The difference between the goal diopter and the postoperative refractive error was greater in group A (5.1 [+ or -] 4.7 versus -0.5 [+ or -] 0.4), but the difference was not statistically significant (P = 0.607).
The approved device allows correction of up to 2 diopters of post-operative sphere and/or -0.75 to -2 diopters of residual postoperative refractive cylinder.
###simK (diopters)###48.28+-4.47###51.11+-4.85###0.022
This lens is called an Onufryk lens (sector prism), and its limit is 20 diopters. The choice is between a clear image of a ground-in lens versus the greater displacement of a higher-power Fresnel 20-40 diopter lens.
Along with relieving the eyes and headache, it gradually decreased diopters. The device combines magnetic and mechanical action on the important acupuncture points around the eyes and in this way it helps to normalize the functions of the organs of vision.
The mean target spherical refraction was -1.11 [+ or -] 0.17 diopters (myopic) and the mean achieved spherical refraction was 1.18 [+ or -] 0.87 diopters (hyperopic) resulting in a mean hyperopic shift of 2.2 diopters.
Widely used specifications for acceptance of printed circuit boards, such as IPC-6012 and MIL-PRF-31032, call for visual examination to be "conducted at 3 diopters (approx.
According to the company, with the turn of a dial Adlens wearers can adjust their vision between -6 and +3 diopters, correcting 90% of visual acuity errors for eyeglass wearers without astigmatism.
In a test, ophthalmologist Ryan Beveridge, using a lensometer, found that the glasses delivered on the declared corrective power of minus 4.5 diopters to plus 3.5 diopters.
He adds that myopic maculopathy typically affects patients who have at least -6 diopters of nearsightedness with an axial length of greater than 26 millimeters.
It is designed for people with low to moderate myopia ( nearsightedness up to -- 6.00 diopters) with or without astigmatism ( up to -- 1.75 diopters).