CYCLOPENTOLATE hydrochloride was first introduced into Great Britain under the name "Cyclogyl ", but recently a British preparation under the proprietary name "Mydrilate" (Ward, Blenkinsop and Co.) has become freely available, and after the first teething troubles has become a valuable addition to our pharmacological armamentarium. When it was first introduced there was slight difficulty in finding the correct pH, and some of the solutions provided showed instability. Now, at the pH found to be most constant, we have a solution which gives very constant dilatation of practically every type of eye, pathological and normal. This new drug was submitted to a clinical trial in various types of cases, which may be divided into four groups: (1) Routine diagnostic dilatation of pupils. (2) Dilatation in pathological cases. (3) Pre-operative dilatation. (4) Refraction in children of all ages.
The apparatus is similar in principle to the well-known cheiroscope, and the end is achieved by using a mirror to superimpose the two fields. One eye sees a bright point of light and the other a tangent screen, the light being seen through a mirror set at an angle of 450 in front of the viewing eye. The light is thus projected on to the screen which the other eye is viewing directly. As there is no stimulus to fusion the relative positions of the eyes can be charted, with one fixing a given standard point and the other taking up a position relative to it but governed only by muscle tone and balance.The apparatus is small and simple, easy to use, and quite portable. The tangent scale is etched on white plastic board and pen marks can easily be removed from it after use. The target board is set at right angles to this and a mirror is positioned between the two making an angle of 450 to each, with the reflecting surface towards the target. In the target are set nine holes *
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