Novel Technique Secures IOL Haptics in Intrascleral Fixation

Intrascleral secondary intraocular lens (IOL) fixation is a complex surgical procedure used to restore vision when the natural lens’s supporting structures are compromised. A key challenge during this procedure is ensuring the IOL haptics – the arms that hold the lens in place – remain securely positioned within the eye. A simple, adaptable technique utilizing bisected iris hook plugs offers a solution to prevent haptic slippage, potentially improving the success rate of this vision-restoring surgery.

The procedure, detailed by Agarwal and Narang, addresses a critical step in secondary IOL fixation: preventing the haptic from moving or dislodging. Without the natural support of the lens capsule, maintaining haptic stability is paramount to avoid complications like IOL displacement onto the retina. This technique is particularly valuable in both glued IOL procedures and Yamane procedures, two common approaches to secondary IOL fixation. Read more at Healio.

How the Technique Works

The method involves threading the IOL haptic onto a 26-gauge needle, then carefully sliding a bisected iris hook plug onto the haptic. The needle is then withdrawn, leaving the hook plug to firmly secure the haptic near the sclerotomy – the small incision made in the sclera (white part of the eye). In situations where a dedicated iris hook plug isn’t immediately available, surgeons can improvise using the tubing from an intravenous (IV) set, cutting and bisecting a small piece to serve a similar purpose. This adaptability makes the technique accessible in a wider range of surgical settings.

Source: Priya Narang, MS, and Amar Agarwal, MS, FRCS, FRCOphth

The importance of haptic stability cannot be overstated. Because there’s no posterior capsule to provide support, any slippage can lead to serious complications, including the IOL detaching and falling onto the retina. Securing the haptics with this technique allows surgeons to proceed with the remainder of the procedure – whether it involves tucking the haptics as in a glued IOL procedure or creating flanges as in a Yamane procedure – with greater confidence.

Figure 1. A three-piece IOL is injected and placed beneath the subluxated lens. The leading haptic is externalized and held with end-opening forceps (a). The iris hook plug is bisected and slid onto a 26-gauge needle. The haptic of the IOL is threaded into the barrel of the 26-gauge needle (b). The plug is subsequently slid onto the haptic of the IOL (c). The plug securely holds the leading haptic; meanwhile, the trailing haptic is externalized and secured with a plug. Once both haptics are secured safely, the surgeon can manage nucleus emulsification with the IOL scaffold procedure (d to f).

*Source: Priya Narang, MS, and Amar Agarwal, MS, FRCS, FRCOphth*

Understanding Intrascleral IOL Fixation

Intrascleral IOL fixation is typically considered when a patient’s natural lens has become severely subluxated (dislocated) or has been removed due to trauma or other conditions. The procedure involves inserting an artificial lens and securing it to the sclera, providing a stable platform for vision restoration. The success of this procedure relies heavily on the secure placement of the IOL haptics. The National Library of Medicine provides further information on IOL fixation techniques.

Amar Agarwal, MS, FRCS, FRCOphth, director of Dr. Agarwal’s Eye Hospital and Eye Research Centre, and Priya Narang, MS, of Narang Eye Care & Laser Centre, developed and detailed this technique. Their work highlights the importance of innovative solutions to address the challenges inherent in complex ophthalmic surgeries. You can reach Dr. Agarwal at [email protected] and Ms. Narang at [email protected].

The technique described builds on previous work by Beiko and Steinert, who first explored the application of iris hook plugs to prevent haptic slippage. Their initial research laid the groundwork for this refined and adaptable approach. Find their original publication on PubMed.

This relatively simple adjustment to the surgical workflow offers a potentially significant improvement in the reliability of intrascleral IOL fixation. By minimizing the risk of haptic slippage, surgeons can enhance the long-term stability of the implanted lens and improve visual outcomes for their patients. Further research and wider adoption of this technique could contribute to a more consistent and predictable approach to this challenging surgical procedure.

Looking ahead, continued refinement of IOL fixation techniques, coupled with advancements in biocompatible materials, will likely play a crucial role in optimizing visual rehabilitation for patients with complex lens-related issues. Ongoing clinical studies and data collection will be essential to assess the long-term efficacy and safety of these evolving approaches.