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In the trial frame presented here the old time bridge is replaced by a nose grip similar to that on modern spectacle frames. The advantages of this type of bridge over the other are as follows:
It grips the nose on each side, thereby distributing its weight equally on the two sides rather than letting it all rest on the dorsum of the nose.
Once the bridge is adjusted, it cannot slip or slide.
In the case of a straight, nearly vertical nose or a deep saddle nose, the old type of bridge could hardly be kept in position unless the frame was held tightly behind the ears and at the root of the nose, which usually led to pain, so that the frame would have to be released. The new grip eliminates this difficulty. It is more convenient to put on the patient's face and it
Schneck N. AN IMPROVED TRIAL FRAME AND TEMPLES. Arch Ophthalmol. 1938;19(6):981–982. doi:10.1001/archopht.1938.00850180133013
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