Toric intraocular lens and intraocular lens insertion apparatus
A toric intraocular lens includes a lens body, support portions, and connecting portions for connecting the lens body and the support portions. The lens is housed in an insertion apparatus that includes a tubular apparatus body having an insertion tube for the lens and a plunger for moving the lens. Each of the connecting portions is arranged at a position where the connecting portions face each other across a center of an optical axis of the lens body. One end of the flat meridian of the lens body is located at a position opposite to a position, with respect to an axis that passes through the center and connects the connecting portions, at which the plunger contacts the lens body. An angle between the flat meridian and an axis along which the lens is pushed by the plunger is larger than 0° and equal to or smaller than 90°.
1. A toric intraocular lens comprising a lens body having a flat meridian and a steep meridian, a pair of support portions for positioning the lens body in an eyeball, and connecting portions for connecting the lens body and the support portions,
wherein the toric intraocular lens is housed in an intraocular lens insertion apparatus that comprises a tubular apparatus body having an insertion tube at a distal end of the apparatus body for inserting the toric intraocular lens into the eyeball and a plunger for moving the toric intraocular lens to a distal end of the insertion tube,
each of the connecting portions is arranged at a position where the connecting portions face each other across a center of an optical axis of the lens body,
one end of the flat meridian of the lens body is located at a position opposite to a position, with respect to an axis that passes through the center of the optical axis and connects the connecting portions with each other, at which a tip of the plunger contacts a circumference of the lens body, and
an angle θ between the flat meridian of the lens body and an axis of the plunger along which the toric intraocular lens is pushed by the plunger is larger than 0° and equal to or smaller than 90°.
2. The toric intraocular lens according to claim 1 , wherein when the tip of the plunger contacts the circumference of the lens body, the angle θ is equal to or larger than an angle that achieves that a line extending the flat meridian does not intersect the plunger and equal to or smaller than 90°.
3. The toric intraocular lens according to claim 1 , wherein the angle θ is larger than 10° and smaller than 80°.
4. The toric intraocular lens according to claim 1 , wherein the angle θ is substantially equal to 45°.
5. The toric intraocular lens according to claim 1 , wherein a mark is provided for each end of the flat meridian on the lens body.
6. The toric intraocular lens according to claim 5 , wherein a tip of the support portion is located on an axis that connects the marks with each other.
7. The toric intraocular lens according to claim 1 , wherein an angle between the axis that connects the connecting portions with each other and the flat meridian is from 45°−10° to 45°+10°.
8. An intraocular lens insertion apparatus, wherein the toric intraocular lens according to claim 1 is housed in advance in a housing member for housing the toric intraocular lens of the intraocular lens insertion apparatus.