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With the increasing study of muscles the ophthalmologist is more and more finding it beneficial in ordering prisms to give both lateral and vertical effects. He has previously trusted the optician to combine these with lenses. The optician consults his compound prism chart in order to grind the lens correctly. It has seemed to me more logical to write the complete order as one wishes it, and this can be done by consulting the prism chart.
It has been a good many years since a compound prism chart has been published. Practically all of the charts are made for the manufacturing optician. Consequently, the zero begins on the horizontal meridian at the left side and proceeds above the horizontal meridian to the right, clockwise, so that when the physician faces the patient it becomes necessary for him to transpose the axes in writing his prescription. With the new chart the
Allen TD. COMPOUND PRISM CHART. Arch Ophthalmol. 1939;22(1):113. doi:10.1001/archopht.1939.00860070129013
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