The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . r, are sufficient. The child shouldbe seated on a chair between the surgeons knees, and the angle ofthe tubes approximated to the angle of strabismus. Next, the illumi-nation, which may consist of two electric-light bulbs, two lamps, ortwo candles, equally distant from each tube, are arranged, and anobject-slide is placed in each holder. These object-slides should 308 AMBLYOSCOPE, THE consist of pictures familiar to 3ouiig children, but the ones used atfirst should be q
The American encyclopedia and dictionary of ophthalmology Edited by Casey AWood, assisted by a large staff of collaborators . r, are sufficient. The child shouldbe seated on a chair between the surgeons knees, and the angle ofthe tubes approximated to the angle of strabismus. Next, the illumi-nation, which may consist of two electric-light bulbs, two lamps, ortwo candles, equally distant from each tube, are arranged, and anobject-slide is placed in each holder. These object-slides should 308 AMBLYOSCOPE, THE consist of pictures familiar to 3ouiig children, but the ones used atfirst should be quite dissimilar; for example, the picture of a birdand the picture of a cage. The child is now required to look intothe tubes, and is asked what he sees. If one eye is amblyopic to anyconsiderable degree, it is probable that the image of the object be-fore the better or fixing eye will be the only one which is , the illumination must be altered before the other object-slidecan be seen by diminishing the light before the fixing or better eye,and increasing that before the amblyopic or squinting eye, contiuu-. The Worth Aniblyosc-ope. ing with this regulation of lights until both objects are visible andcan be described by the child. This alteration in the lights can beaccomplished in various ways; for example, by changing the dis-tance of the lights, as Worth suggests, or by adapting to the ambly-oscope, as the w^riter has done, a revolving wheel, which containssmoked lenses of different densities, and which can be turned be-fore the non-amblyopic eye. Each object should be seen clearly,and the exercise should be varied with several pairs of , the child is required to place one hand on each of the sur-geons knees and to tap that knee on the side on which the pictureof the bird is seen. If the angle of the tubes is rapidly altered aposition will be found where the slightest movement of the tubescauses the picture of the bird to pass directh^ through
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