| 摘要 |
PURPOSE: To take place of the natural ocular lens and to eliminate the danger of the damage to the tissues of the sensitive eyes during insertion by consisting the lens of a copolymer having a glass transition temp. of a specific temp. range and forming the lens having shape memory. CONSTITUTION: The material of the hard intraocular lens having the shape memory consists of the copolymer having a glass transition temp. Tg in the range of 40 to 60 deg.C. The deformation of this material to the shape of a straight or bent rod having an adequate shape for operation, a diameter of 1 to 4mm, is possible. The lens having the given Tg is heated to about 50 deg.C and is deformed at this temp. The lens is cooled to fix this deformation. The lens deformed by this method retains the deformed state after the operation until the eye is rinsed by a washing soln. of >=40 deg.C. The lens begins to be uncoiled to its final shape and is cured again after the temp. falls down to 37 deg.C. Such hard intraocular lens is not affected by the vibration of the eye and obviates the occurrence of the focus lack is visual sensation.
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