Abstract
A corneal freezer without electrical or mechanical function is described. Cooling is achieved by partial immersion of the freezing unit in liquid N. The cooling rate is controlled by the heat content in the unit and the facility for heat removal from the unit. Corneas are frozen in aluminum vials. Corneas are thawed in < 30 s without risk of overheating, when the vials are placed on the metal core of another freezing unit at room temperature.

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