For the past year I have been using a new impression material for the making of molds of the human eye. Molds have been made in the past (Stevens1 and Obrig2) with the plastic material negocoll. But the time element (two minutes, shortest approximate time) for the gel to set on the eye works some hardship on the patient, it being difficult to keep the eyes fixed in one position for any length of time.
In order to obtain a fast setting gel, I sought the assistance of J. J. Jansen, D.D.S., of San Francisco, who about a year ago was developing a reversible hydrocolloid gel. After some modifications in the density and consistency of his original preparation, successful molds were made in one minute or less. This elastic impression material is now known as Kerr's hydrocolloid and is manufactured by the Detroit Dental Manufacturing Company. To facilitate
Maisler S. CASTS OF THE HUMAN EYE FOR CONTACT LENSES. Arch Ophthalmol. 1939;21(2):359–361. doi:https://doi.org/10.1001/archopht.1939.00860020163013
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