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The construction of the eye dropper is such that the contained fluid comes in contact with its rubber bulb or cap, and this not alone at a time following a change in its position from the vertical to the horizontal but also when the rubber bulb has a greater pull than is necessary to fill merely a part of the glass tubing, and, as a result of this, the contents act on the rubber bulb and produce a change that becomes a source of danger when dropped onto or into sensitive parts of the body. An applicable example is the danger at the time of a cataract extraction when an open wound is exposed to these products of rubber dissolution.
This danger is so obviously true concerning the harm that can come from the disintegrated rubber in an open wound that it was thought proper to devise an eye dropper
Dimitry TJ. THE EYE DROPPER. JAMA. 1934;102(26):2180. doi:10.1001/jama.1934.62750260003009b