. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, Fig. 154.—Maddox Rod. Fig. 155. a piece of plane dark red gkss before one eye, so that thered light always corresponds to the eye with the red a Maddox rod (Fig. 154), white or red, may be usedfor the same purpose. This may be a series of rods (seeFig. 155) placed in a metal cell of the trial-case, and theeye, looking through it at the light, will see the image ofthe flame distorted into a streak of broken light. A strong4- cylinder from the will an
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, Fig. 154.—Maddox Rod. Fig. 155. a piece of plane dark red gkss before one eye, so that thered light always corresponds to the eye with the red a Maddox rod (Fig. 154), white or red, may be usedfor the same purpose. This may be a series of rods (seeFig. 155) placed in a metal cell of the trial-case, and theeye, looking through it at the light, will see the image ofthe flame distorted into a streak of broken light. A strong4- cylinder from the will answer the .same pur-pose. As the rod refracts rays of light opposite to its axis,the eye will see a streak of light in the reverse meridian to MUSCLES. 183
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