Ocular refraction and the shadow test . t of holding the retinoscope firmlyagainst their forehead, and tilt the mirror by a movement of thehead, to the right and left, up and down, etc. This style of operat-ing appears awkward, the operator bobbing his head in an apparent-ly aimless fashion; it gives one the appearance of one of the porce-lain figures representing a Chinese Mandarin. I R E T I N O S C O P Y. 171 It is just as well to cultivate a clean-cut style of operating,which is not difficult ; it pays well, because it inspires confidence inthe patient to have the Refractionist display an
Ocular refraction and the shadow test . t of holding the retinoscope firmlyagainst their forehead, and tilt the mirror by a movement of thehead, to the right and left, up and down, etc. This style of operat-ing appears awkward, the operator bobbing his head in an apparent-ly aimless fashion; it gives one the appearance of one of the porce-lain figures representing a Chinese Mandarin. I R E T I N O S C O P Y. 171 It is just as well to cultivate a clean-cut style of operating,which is not difficult ; it pays well, because it inspires confidence inthe patient to have the Refractionist display an easy manner in hiswork, denoting familiarity with it, and skill. Plate 138 illustrates the light beam from the retinoscope project-ed directly upon the eye. In the illustration it is seen to create acircular spot of light upon the face, about two inches in diameter. This is called the Light Area. If the retinoscope be tilted slightly, this light area will of coursemove also, and a/:c,ns in the Sd///e direct ion as the mirror is Plae 138. Light !)eam from the retinoscope directed full upon the eyarea upon the face, and the luminosity of the pupil, or in contrast with the darkness in the pupil of the other eyephotograph from life. The reflex is seen occupying theserves to illustrate the choked appearance of the reflelocated with the retinosc ider observation. The light inal reflex, is clearly shown ;. This plate was made from a entire pupillary area. This also X when the point of reversal is If the light area is made to pass across the pupil, folloiving astraight line, it is said to liave made a transit of the pupil. A transit of the light area thus means, that in passing across the pupil, one of the meridians of the eye is followed. By means of the transit of the light, the observer is enabled to estimate the character of the refraction of the eye in that one particular meridian traversed. If the eye be emmetropic, hypermetropic or myopic, it possesses 172 OCULAR REFRAC
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