Journal - American Intra-Ocular Implant Society最新文献

I present a BASIC language computer program that can be used on a variety of home computers to calculate intraocular lens powers and print this information on a report that can be included with hospital or office records and easily read in the operating room.

Sodium hyaluronate is a valuable aid for phacoemulsification and intraocular lens insertion. Procedures such as anterior capsulotomy, polishing the capsule, lens adjustment, incision closure, and conversion to planned extracapsular cataract extraction are facilitated when sodium hyaluronate is used. A new method of removing it from the eye is presented.

We reviewed 23 consecutive cases of intraocular lens implant exchange. Lens dislocation (26%) and chronic intraocular inflammation (26%) were the most frequent indications for lens exchange. Postexchange vision was best in those eyes treated for inappropriate implant power (100%⩽20/40), intermediate in dislocation cases (83%⩽20/40), and poorest in eyes with chronic intraocular inflammation (50%⩽20/40), even though the inflammation usually improved. Eighty-three percent of the total cases remained within one line of the pre-exchange visual acuity.

The patient presented in this paper had a clinically clear but optically disturbing posterior capsule. The patient was able to visualize transparent refractive anomalies in the posterior capsule and the fine structure of a cataractous lens.

One hundred fifteen patients with cloudy posterior capsules that required capsulotomies were evaluated by laser interferometry. The predicted acuity was within one line of postoperative acuity in 44 patients (38.3%) and within two lines in 73 patients (63.5%). The correlation coefficient between the predicted and actual postcapsulotomy acuities was 0.38. However, the predicted retinal visual acuity was compared to postoperative Snellen visual acuity and found to differ by an average of three lines. A large number of false negative results reduced the clinical usefulness of the test.

We summarize the findings of five randomized prospective, controlled studies that evaluated the following factors associated with the development of cystoid macular edema (CME) following cataract surgery: ultraviolet (UV) light from the operating microscope; postoperative UV light exposure; primary capsulotomy; retrobulbar hyaluronidase; and prostaglandin synthesis in the eye. The following were the major findings: (1) The presence of a UV-light filter on the operating microscope during cataract surgery made no statistically significant difference in the early postoperative (two to six months) angiographic incidence of CME or the visual outcome. (2) A UV-filtering posterior chamber intraocular lens (IOL) resulted in a statistically significant decrease in the early postoperative incidence of angiographic CME in postcataract-surgery patients but did not affect visual acuity. (3) Patients receiving primary capsulotomy during extracapsular cataract surgery showed a statistically significant higher incidence of early postoperative angiographic CME than did patients with an intact posterior capsule. Again there was no difference in visual acuity. (4) The addition of hyaluronidase to the retrobulbar anesthetic injection made no significant difference in the CME rate or postoperative visual results of patients undergoing extracapsular cataract surgery. (5) Patients undergoing IOL implant surgery who received topical indomethacin before surgery and for nine months postoperatively to inhibit prostaglandin synthesis in the eye showed a statistically significant lower incidence of early postoperative angiographic CME than did placebo-treated patients, but there was no significant difference between the two groups in postoperative visual acuity.