Modification of Intraocular Lens Insertion Using 4-Flanged Fixation With a Standard Cartridge and a 2.4 mm Corneal Incision in Eyes With No Capsular Support
Mahler O, Einan-Lifshits A, Hecht I, Biron R, Pras E, Dubinsky-Pertzov B1
Industry support: None
Mahler and colleagues developed a technique for IOL implantation and fixation in aphakic eyes and those that lack capsular support. Their technique is a simplification of the sutureless flange technique for scleral fixation described by Canabrava et al.2,3 The proposed modification allows an IOL with four eyelets to be implanted through a 2.4-mm corneal incision with minimal equipment.
Study in Brief
Surgeons proposed a technique for the scleral fixation of an IOL in eyes that lack capsular support. An IOL with four eyelets is inserted through a 2.4-mm corneal incision and anchored to the sclera with four flanges made from 6-0 polypropylene sutures, thereby improving IOL stability.
WHY IT MATTERS
The technique appears to be a simple alternative for scleral fixation that combines the advantages of the flange technique with the use of a small corneal incision.
A precut 6-0 polypropylene suture with sharp edges is threaded through both leading loop haptics of an Akreos AO60 IOL (Bausch + Lomb). Two marks are made 2 mm from the limbus and 4 mm apart both nasally and temporally for a total of four marks. The threaded IOL is loaded into the cartridge so that the suture passes through the cartridge nozzle and into the anterior chamber through the corneal incision. A 30-gauge bent needle is inserted through the conjunctiva and sclera adjacent to the marks and then turned radially to penetrate the eye through the inferior mark at the 9 clock position to form a scleral tunnel. Next, the end of the suture is inserted into the lumen of the needle with the handshake technique4 and pulled out of the eye. The process is repeated with another 30-gauge needle to leave the other end of the suture at the superior mark. After securing the two sutures at one side (temporal or nasal), the IOL is injected into the eye using the standard injector.
Another 6-0 polypropylene suture is inserted through the main incision, and the steps are repeated at the opposite side. Finally, the IOL is centered, and low-temperature cautery is used to create flanges, which are subsequently buried under the conjunctiva.
The technique was used successfully in six eyes of five patients. Mean follow-up time was approximately 2 months, and all of the IOLs were well centered and stable. No intra- or postoperative complications were observed.
Strategies for IOL implantation in the absence of capsular support include the use of an anterior chamber IOL, an iris claw IOL, and iris or scleral fixation. Each of these techniques has drawbacks.5-8 The flange technique for scleral fixation recently became a popular alternative for scleral fixation in which the IOL is manually folded and inserted through a 3.4- or 2.7-mm incision.2,3,9
The proposed modification by Mahler et al simplifies the technique to allow the IOL to be inserted through a 2.4-mm corneal incision using a standard IOL cartridge. This reduces the potential for complications such as wound leakage, surgically induced astigmatism, and infection.10 The use of an IOL cartridge, moreover, reduces the risk of scratches and irreversible imprints on the IOL.11,12 Anchoring four points of the IOL to the sclera reduces the risk of IOL tilt. Additional advantages of the technique are that a leading needle is not required for a 6-0 polypropylene suture because of its thickness and the suture can be inserted directly into a 30-gauge needle. Finally, the technique can speed up visual rehabilitation.
Correcting Optic Capture With 2 Flanged 6-0 Sutures After Intrascleral Haptic Fixation With ViscoNeedling
Mascarenhas Menna Barreto V, Mascarenhas Menna Barreto C, Kern Menna Barreto P, Kern Menna Barreto R13
Industry support: None
Flanged IOL fixation or the Yamane technique is performed to fixate an intrascleral IOL without the use of a suture or glue.14 Yamane et al reported that optic capture of the IOL occurred in more than 5% of the cases in their series.15,16 Mascarenhas and colleagues proposed a technique for managing this complication.13
Study in Brief
A visconeedling technique was used to correct optic capture of the IOL by the pupil in two eyes in which the Yamane technique for scleral fixation had been used.
WHY IT MATTERS
The technique appears to be simple and could be performed in other surgical scenarios involving sutures inside the eye.
Two ultrathin-walled 30-gauge needles are prepared. One is bent 20º at 12 mm from the tip, and the other is bent 45º degrees at 7 mm from the tip. Both needles are filled with a small amount of an OVD. The first needle is attached to an OVD syringe. A 6-0 polypropylene suture that is 4.5 cm in length is fully introduced into the first needle. The second needle is attached to an insulin syringe.
The needles are passed between the IOL and the iris, over the IOL, 2 mm posterior to the limbus. The two tips are then positioned close together. The plunger of the OVD syringe is pushed until the suture penetrates the lumen of the second needle and advances about 7 mm. The needles are then removed, while each end of the suture is withdrawn from the eye. High-temperature cautery is used to create a flange at each end.
The steps are repeated about 4 mm away from the first suture to create a second parallel suture with two flanges. Tension on the sutures is then adjusted, and all four flanges are buried under the conjunctiva.
At 6 and 9 months, respectively, results for two cases were optimal, and neither patient experienced a recurrence of iris-optic capture.
The visconeedling technique is performed in a closed system. Neither special devices nor an OVD is necessary to maintain a deep anterior chamber.17 The larger diameter of the 6-0 polypropylene suture should reduce the rate of degradation compared to a 10-0 suture.18,19 To optimize suture tension, Mascarenhas and colleagues suggested applying counterpressure on the contralateral flange while making the second flange. Further adjustments can be made later at the slit lamp. They suggested that introducing the sutures 2 mm posterior to the limbus should reduce the risk of surgically induced astigmatism if the sutures are too tight.
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