| 摘要 |
<p>Small aperture (pinhole) intraocular implant to increase depth of focus comprising a diaphragm (21, 21', 21 ") juxtaposed to the front surface of a lens implanted previously, having its anterior surface convex and its posterior surface concave. The diaphragm (21, 21', 21 ") is held in position by inserting engaging means (25, 25', 25 ") in the ciliary sulcus (13). It is proposed that said diaphragm is opaque to a visible light spectrum and transparent to light in the infrared range and is equipped with passage means (23) of visible light in its central region, such as a through hole whose diameter is between 1 mm and 2.5 mm. The constriction of the incident light rays increases the depth of focus, featuring a pinhole effect. The engagement means may be provided by two handles (25) shaped with curved proximal ends joined to the peripheral edge of said diaphragm (21) and having substantially circular section with a diameter between 80µm and 800µm or two handles (25') of the same material as the diaphragm and constituting an extension of this edge, or even one elongated platform (30) whose center is located in the small-diameter circular opening (21").</p> |
