Partial-thickness scleral tethering suture for optimum fixation and centration of transscleral-sutured intraocular lens-capsule complex.

We describe a surgical technique for fine-tuning the centration of a transscleral-sutured modified capsular tension ring (CTR)-intraocular lens-capsular bag complex using a partial-thickness scleral tethering suture placed posterior to the external episcleral portion of a transscleral suture loop. The technique can be used for adjusting the centration of any intraocular supporting or prosthetic device that is transsclerally sutured in a "hanging" technique, such as capsular tension segments, modified CTRs, capsular anchoring devices, or iris prostheses.

Miotics after modern cataract surgery are history.

PURPOSE: The aim of this study was to investigate the usefulness of a long-acting miotic (physostigmine) after phacoemulsification in preventing peripheral anterior synechiae (PAS), lens dislocation, and high postoperative intraocular pressure. METHODS: This was a prospective randomized controlled trial of 400 patients (400 eyes) scheduled for phacoemulsification. Patients were randomly assigned either to receive a single application of physostigmine ointment directly after phacoemulsification or not. The main outcome measures were the change of intraocular pressure (IOP) before and after surgery, number of extra outpatient clinic visits within 4 weeks postoperatively, verbal rating pain scale (VRS), status of the angle by gonioscopy, and best corrected visual acuity (BCVA). RESULTS: There was no significant difference in IOP and BCVA between both groups. There were more patients who reported a VRS score of more than 3 in the physostigmine group (P=0.021). PAS or (anterior) lens dislocation was not observed. CONCLUSION: In eyes without co-morbidity, the routine use of physostigmine ointment has lost its rationale.

Out-of-the-bag intraocular lens dislocation: outcomes of posterior chamber intraocular lens exchange, risk factors, and prevention.

BACKGROUND: Dislocation of posterior chamber intraocular lens is one of the most common complications of intraocular lens implantation. Lens exchange is an effective solution to this unsatisfactory status. This study was conducted to analyze the possible predisposing factors for out-of-the-bag posterior chamber intraocular lens dislocation and to study the outcomes of lens exchange surgery. METHODS: Thirty-six consecutive patients (36 eyes) with out-of-the-bag intraocular lens dislocation who underwent posterior chamber intraocular lens exchange in Zhongshan Ophthalmic Center of Sun Yat-sen University (Guangdong, China) from January 2003 to October 2009 were included. A 6-month follow-up was completed. The causes for out-of-the-bag intraocular lens dislocation and visual outcomes of posterior chamber intraocular lens exchange were analyzed. The out-of-the-bag intraocular lens dislocation was diagnosed on the basis of the findings from slit-lamp microscope and B-ultrasound. The dislocated intraocular lens was explanted. Reimplantation of a new posterior chamber intraocular lens was performed in each case using standardized surgical procedures. RESULTS: In this study, a total of thirty-six consecutive patients (36 eyes) with out-of-the-bag intraocular lens dislocation underwent posterior chamber intraocular lens exchange surgery. Causes for out-of-the-bag intraocular lens dislocation included posterior capsule rupture during the initial cataract extraction procedure (23 eyes, 63.8%), trauma (5 eyes, 13.9%),neodymium-doped yttrium aluminium garnet (Nd:YAG) laser-induced dislocation (2 eyes, 5.6%), the status after vitrectomy (2 eyes, 5.6%) and unidentifiable etiology (4 eyes, 11.1%). Symptoms of these patients mainly included decrease in visual acuity (17 cases, 47.2%), blurred vision (16 cases, 44.4%), glare (1 case, 2.8%), diplopia (1 case, 2.8%), and halo (1 case, 2.8%). Intraocular lens dislocation into the posterior vitreous cavity (29 eyes, 80.5%), anterior chamber (1 eye, 2.8%) and anterior vitreous cavity (6 eyes, 16.7%) was found in this series. The foldable intraocular lenses (acrylic or silicone) were explanted from 27 eyes (75%) and rigid intraocular lenses (poly methyl methacrylate, PMMA) from 9 eyes (25%). The most common explanted intraocular lens material was single-piece acrylic (13 pieces, 36.1%), followed by 3-piece acrylic (9 pieces, 25%), single-piece PMMA (9 pieces, 25%), and 3-piece silicone (5 pieces, 13.9%). Uncorrected visual acuity postoperatively improved in 29 eyes (81%), unchanged in 4 eyes (11%), and worsened in 3 eyes (8%) in comparison to that before exchange operation (P = 0.006). Best corrected visual acuity tended to improve, but the improvement was not significant (P = 0.206). Complications related to lens exchange surgery were mainly intraocular lens redislocation (1 eye), retinal detachment (1 eye), vitreous hemorrhage (1 eye), and cystoid macular edema (1 eye). CONCLUSIONS: Out-of-the-bag intraocular lens dislocation was mainly caused by posterior capsule rupture during the initial cataract extraction procedure and the foldable lens was the most common dislocated intraocular lens. In most cases, posterior chamber intraocular lens exchange surgery could provide satisfied final visual outcomes.

Surgical strategies for the management of zonular compromise.

PURPOSE OF REVIEW: To evaluate new surgical treatment of zonular instability during cataract surgery. RECENT FINDINGS: The increased risk of complications associated with zonular compromise during cataract surgery has led to development of the capsular tension ring. More recently, the modified capsular tension ring and capsular tension segment have been introduced, allowing improved capsular stability and intraocular lens centration by scleral-suture fixation. Capsule support hooks also have a role in capsular stabilization. SUMMARY: When faced with zonular instability, the increased availability and use of capsular support devices allow for improved safety and outcome in cataract surgery.

Avoiding and managing the dislocated crystalline lens.

A major complication of cataract surgery is the posterior dislocation of crystalline lens material, which may lead to poor visual outcomes. Knowledge of preoperative high-risk situations, causes of lens dislocation, and intraoperative warning signs should lead to reduced complications. This update reviews techniques to avoid the dislocated lens, and management options if this complication does occur.

Malpositioned posterior chamber lenses: etiology, prevention, and management.

The various types of posterior chamber intraocular lens malpositions, in increasing degrees of severity, are described. These include pupillary capture, optic decentration, malpositioned loop, windshield wiper, sunrise, sunset and lost lens syndromes. The etiologies, management, and prevention of these complications are discussed.

Laser-coagulation of ruptured fixation suture after lens-implantation.

Before it was known that polyamide tends to dissolve in tissue, nylon sutures were used to fixate 2-loop-Medallion-lenses to the iris. As was to be expected cases turned up in which the suture had ruptured. This situation entails the danger of contact between the end of the broken suture and the endothelium. By coagulation of the suture with a laser beam the danger was eliminated.