By Duane W., Mazumder K. C.
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Extra info for Absorption of Short X-Rays by Aluminium and Copper
25 D in one eye is seldom prescribed. UNDERSTANDING DIOPTERS AND DIVERGING LENSES LENSES: DIOPTER, AXIS, A N D B A S E DIOPTERS A diopter, abbreviated "D," is a unit of mea surement of the refractive power of a con cave, convex, or cylindrical lense. The number of diopters indicates the light-bending abil ity of a lense. The more diopters, the more refractive power of a lense, and, generally, the more curvature in a lense. When parallel light rays pass from air through a curved piece of glass or other trans parent material, they change direction.
Usually this is the number of diopters needed to correct the nearsighted eye back to 20/20 normal sight. g. 20/40. In our example, the Distance vision has a Chapter correction of - 7 . 2 5 D for the right eye, and - 6 . 7 5 D for the left eye. This is not a bifocal prescription because there is no Near/Add diopter measurement in the bottom two rows. g. - 7 . 2 5 DS, or - 7 . 2 5 D. S. DS means diopters of spherical correction. The plus or minus sign in front of the number of diopters indicates whether the correction is for nearsightedness or farsightedness.
By the for mer method it would be impossible, for instance, to get any information about the refraction of a baseball player at the moment he swings for the ball, at the moment he strikes it, and at the moment after he strikes it. But with the retinoscope it is quite easy to determine whether his vision is normal, or whether he is myopic, hypermetropic, or astigmatic, when he does these things; and if any errors of refraction are noted, one can guess their degree pretty accurately by the rapidity of the movement of the shadow.
Absorption of Short X-Rays by Aluminium and Copper by Duane W., Mazumder K. C.