Intraocular lens and manufacturing method thereof
An intraocular lens adapted for deployment within a lens capsule. At least part of a lens surface of the intraocular lens constitutes a cell inducing region in which are directly formed a multitude of microgrooves. The microgrooves take a form of minute linear grooves and lands of depth dimension between 0.01 and 1.0 μm and width dimension between 0.1 and 2.0 μm extending with prescribed length in a circumferential direction on the lens surface. The minute linear grooves and lands are formed with a chained pattern connected in the circumferential direction of the lens surface and with a periodic pattern arrayed periodically in a diametrical direction so that the minute linear grooves and lands are formed without intervening spaces throughout the entire cell inducing region and impart visible light transmittance of 60% or above to the cell inducing region.
1. An intraocular lens adapted for deployment within a lens capsule, wherein the improvement comprises:
at least part of a lens surface constituting a cell inducing region in which are directly formed a multitude of microgrooves;
the microgrooves taking a form of minute linear grooves and lands of depth dimension between 0.01 and 1.0 μm and width dimension between 0.1 and 2.0 μm extending with prescribed length in a circumferential direction on the lens surface; and
the minute linear grooves and lands being formed with a chained pattern connected in the circumferential direction of the lens surface, and a plurality of the minute linear grooves and lands being formed with a juxtaposed arrangement in a direction orthogonal to the circumferential direction of the lens surface so that the minute linear grooves and lands are formed without intervening spaces throughout the entire cell inducing region and impart visible light transmittance of 60% or above to the cell inducing region.
2. The intraocular lens according to claim 1 , wherein the minute linear grooves and lands have circumferential length dimensions of between 1.0 and 50.0 μm.
3. The intraocular lens according to claim 1 , wherein the cell inducing region is formed in an outside peripheral section of at least one of a lens front face and a lens back face.
4. The intraocular lens according to claim 3 , wherein the cell inducing region is formed on at least one of the lens front face and the lens back face, exclusively in the outside peripheral section thereof which excludes a center section.
5. The intraocular lens according to claim 4 , wherein the cell inducing region that is formed exclusively in the outside peripheral section of at least one of the lens front face and the lens back face is a region extending 2 mm or less in a lens diametrical direction from a lens outside edge.
6. The intraocular lens according to claim 1 , wherein the minute linear grooves and lands are formed on a surface of an edge portion which includes a lens outside edge face, and the cell inducing region includes the surface of the edge portion.
7. The intraocular lens according to claim 1 , wherein in a cross section of the cell inducing region taken in a direction orthogonal to a lens circumferential direction, the minute linear grooves and lands are formed with periodic cross sectional contours represented by a periodic function.
8. The intraocular lens according to claim 1 , wherein at least one of the lens surfaces is formed using a resin mold molded by a die having minute linear grooves and lands formed on a molding face thereof so that the minute linear grooves and lands are transferred therefrom; and the cell inducing region is formed through transfer of the minute linear grooves and lands on the resin mold to the lens surface.
9. A method of manufacturing an intraocular lens adapted for deployment within a lens capsule comprising the steps of:
forming at least one of lens surfaces using a resin mold molded by a die;
subjecting a resin mold molding face of the die to bombardment with at least one of radiation and a laser beam to produce microgrooves thereon;
transfer molding the microgrooves produced on the die to a lens molding face of the resin mold; and
retransferring the microgrooves that were transferred to the resin mold at least one of the lens surfaces to form on at least a portion of the lens surface a cell inducing region having a multitude of microgrooves directly formed therein,
wherein the microgrooves take the form of minute linear grooves and lands of depth dimension between 0.01 and 1.0 μm and width dimension between 0.1 and 2.0 μm extending with prescribed length in a circumferential direction on the lens surface, and the minute linear grooves and lands are formed with a chained pattern connected in the circumferential direction of the lens surface, and a plurality of the minute linear grooves and lands are formed with a juxtaposed arrangement in a direction orthogonal to the circumferential direction of the lens surface, thereby forming the minute linear grooves and lands without intervening spaces throughout the entire cell inducing region and imparting visible light transmittance of 60% or above to the cell inducing region.
10. The intraocular lens according to claim 1 , wherein the plurality of minute linear grooves and lands are formed so as to conjoin with their ends connected to one another, with substantially no space between them in the circumferential direction.
11. The method of manufacturing an intraocular lens according to claim 9 , wherein the laser beam is a laser beam having a pulse width of between 1×10 −16 second and 1×10 −7 second.
12. The method of manufacturing an intraocular lens according to claim 9 , wherein the plurality of minute linear grooves and lands are formed so as to conjoin with their ends connected to one another, with substantially no space between them in the circumferential direction.