intraocular lens implantation

The intraocular lens is currently the most effective method for correcting the refractive power of aphakic eyes. It replaces the original lens anatomically and optically, forming an approximately normal system, especially the posterior chamber artificially fixed at the physiological position of the normal lens. Lens. Can be used for single eye, can quickly restore vision after surgery, easy to establish binocular single vision and stereo vision. Indication 1. Monocular or binocular senile cataract. 2. Trauma or complicated cataract. 3. Infants and children with cataracts. 4. Some aphakic eyes with posterior capsule support. Contraindications 1. Congenital abnormalities such as small eyeballs and small corneas. 2. Neovascular glaucoma with iris reddening. 3. With central retinal vascular occlusion, intraocular tumors, proliferative diabetic retinopathy, and other proliferative retinopathy. 4. Congenital glaucoma. Preoperative preparation Basically the same as modern extracapsular cataract extraction. Surgical procedure 1. After completing the extracapsular cataract extraction, inject a proper amount of viscoelastic material into the front and back chambers or the capsular bag, and remove one of the lines in the middle to make the opening width 6.0 to 6.5 mm. 2. Implantation of the intraocular lens and the optical part When the optical part is clamped with the forceps, the running direction of the artificial lens is completely controlled by the hand, and a good hand is required. When the top of the lower jaw has reached the center of the pupil, or the leading edge of the optical part has entered the incision, the forceps should be relaxed in time, and the crystal is pushed down from the lower edge of the crystal. The crystal will slide slowly to the posterior chamber under the shear force limitation of the incision. 3. Implanted on the crystal, confirm that the crystal sputum reaches the ciliary sulcus or capsular bag, hold the top of the upper ridge with the crystal ,, compress the crystal in the direction parallel to the crystal optics, and make the clockwise direction in the tangential direction. Rotate, when the upper knee passes over the edge of the pupil, gently press the upper jaw to turn it to the iris and relax the forceps. The upper jaw will spring to the corresponding ciliary groove. At this time, it is also possible to insert the crystal plate from the auxiliary slit to press the optical portion to prevent lifting. In some cases, it is simple and easy to use the positioning hook to rotate the cymbal on the crystal, which can be used as a supplement to the capsule feeding method. That is, the positioning hook is inserted into the positioning hole to push the rotation motion to make the crystal rotate clockwise. The upper jaw of the crystal will be compressed under the tension of the pupil, and once the knee crosses the edge of the pupil, it will spring toward the ciliary sulcus. 4. Adjust the crystal position by using the continuous motion of push, spin and pressure to make the crystal in place once, generally no need to re-position. If the crystal has obvious deviation, the positioning hook can be hooked to the positioning hole, and according to the purpose of adjustment, slightly push-pull, swing and rotate until the crystal is in the positive position. In the case of a small pupil, the upper jaw can be implanted by screwing. That is, the optical portion is held by the crystal crucible, and the optical portion and the root of the lower jaw are first inserted into the ciliary sulcus. The free part of the upper jaw is then screwed in. The upper jaw can still be implanted by the capsule method. After the incision is completely closed, it is implanted by the crystal positioning hook.