| 摘要 |
A system (10) for reducing the radius of curvature of a cornea is provided which includes a device having an electrically resistive ring (14), an insulative shaft (16) coupled to the ring, and an electrical lead (18) coupl ed to the ring (14), and an insulation handle coupled to the ring (14) which facilitates manipulating the ring for from the cornea (34) of the eye (30), and through which the lead extends. The lead is couplable to a current sourc e (20). According to a preferred aspect of the invention, a function generator (22) is provided between the current source (20) and the ring (14) to genera te a function of heat energy provided to the ring (14). The function generator permits very precise applications of current to the ring, and may be configured to heat the ring to a desired temperature, to maintain the temperature for a predetermined amount of the time, or to provide a heat profile. An astigmatism correction device (10), preferably operable in conjunction with the hyperopia heating device, is also provided. The device includes an element which is shaped to provide heat energy at two location 180~ apart, and preferably fits within the annular opening of the hyperopia correction device. The device may be actively heated by the same power sourc e (20) as the hyperopia correction device, may be passively heated by the hyperopia correction device, or may be separately heated. |
