Most scleral buckles are safe for MRI scanning. The vast majority of these implants are made from solid silicone rubber or silicone sponge, neither of which is ferromagnetic, meaning they will not be pulled or heated by the powerful magnets inside an MRI machine. The concern that leads people to search this topic is understandable: you have a permanent device sutured to the outside of your eye, and now someone wants to put you inside a tube generating a magnetic field thousands of times stronger than the Earth’s. But the safety picture is reassuring for most patients, with a few important exceptions that depend on when you had your surgery and exactly what materials were used.
What a Scleral Buckle Actually Is
A scleral buckle is a device placed on the outside of the eyeball to treat a type of retinal detachment where the retina tears and peels away from the back wall of the eye. The buckle presses the wall of the eye inward, pushing it back into contact with the detached retina and sealing the break. It remains permanently sutured in place in most cases, creating a long-lasting support that keeps the retina attached while healing occurs.1PubMed Central. Scleral Buckling: A Review of Clinical Aspects and Current Concepts The technique has been around for decades and, when used for the right cases, is simple and highly effective.2PubMed. Scleral buckling-a brief historical overview and current indications
Because the buckle stays in the body permanently (unless surgically removed for a complication), any patient who later needs an MRI for any reason has to consider whether the implant is compatible with the scanner. This is the same concern that applies to any permanent implant, from joint replacements to cardiac stents to aneurysm clips. The answer hinges entirely on what the buckle is made of.
Material Composition Is What Determines MRI Safety
Scleral buckle materials fall into two broad categories: non-metallic and metallic. Understanding which category your implant belongs to is the single most important factor for MRI safety.
The non-metallic group dominates modern practice. Solid silicone rubber is currently the most widely used scleral buckle material. It is soft, easy to handle during surgery, and well tolerated by the body over long periods.3Survey of Ophthalmology. Scleral implants: An historical perspective Silicone sponge is also common and has the advantage of being extremely soft, conforming well to the curvature of the eye. Both materials are completely non-ferromagnetic. They contain no metal, generate no magnetic interaction with the MRI field, and produce no meaningful heating during a scan. For the large majority of patients who received a standard silicone buckle, MRI at any field strength, including the common 1.5 Tesla and 3 Tesla machines, is not a safety concern from the implant itself.
Over the years, surgeons have also used absorbable materials for scleral buckling, including donor tissue like cadaver sclera and fascia lata, as well as gelatin-based implants.3Survey of Ophthalmology. Scleral implants: An historical perspective These biological and semi-synthetic materials are also non-ferromagnetic and pose no MRI hazard. If you had one of these, and it was truly absorbable, it may no longer be present at all.
When Metallic Clips Were Used
The safety question gets more interesting for a small subset of patients whose scleral buckling procedure involved metallic clips or sutures to secure the buckle to the eye wall. In rare cases, a metal clip was used during the surgery. Some metallic clips can pose a risk during MRI, depending on what metal they are made of.
Tantalum clips, specifically, are considered safe for MRI because tantalum is a nonferrous, nonmagnetic metal. It does not interact with the magnetic field in a way that could move the clip or heat the surrounding tissue. However, clips made from ferromagnetic metals like certain stainless steel alloys could, in theory, experience a pulling force or torque inside the scanner. This distinction matters: the specific metal, not just the presence of metal, is what determines safety.
The practical challenge is that many patients do not know exactly what clip material was used during their surgery, especially if the procedure was performed decades ago. Older operative reports may not specify the alloy. If you had scleral buckling surgery before the 1990s and metallic clips were involved, identifying the exact material can require digging through medical records or contacting the original surgical center. When the material cannot be identified, MRI facilities typically err on the side of caution and may delay or decline the scan until more information is obtained.
The MIRAgel Hydrogel Complication
One buckle material deserves special attention, not because of MRI danger from magnetism, but because of a different set of problems that MRI actually helped uncover. MIRAgel, a hydrogel-based scleral buckle material, was used during the 1980s and into the 1990s. It was initially considered promising because hydrogel was thought to be an ideal implant material due to its softness and biocompatibility.
The problem emerged years or even decades after implantation. MIRAgel buckles can absorb fluid over time, swelling significantly and causing a cascade of complications including restricted eye movement, inflammation, and dangerously elevated intraocular pressure. In one documented case, a patient who had received a MIRAgel buckle years earlier developed these symptoms, and an MRI scan revealed the swollen buckle material around the eye. The MRI showed characteristic signals consistent with a fluid-filled mass where the buckle had expanded, and inflammation in the surrounding tissue and eyelid.4American Journal of Ophthalmology Case Reports. Irreversible intraocular pressure elevation as a complication of MIRAgel scleral buckling
The MIRAgel story is relevant to MRI safety discussions in two ways. First, MRI was actually useful for diagnosing the complication, meaning the scan itself was safe to perform on the eye with the hydrogel implant. Second, it illustrates that not all buckle complications are about magnetism. A material can be non-ferromagnetic and still cause serious problems that only become apparent years later. If you received a scleral buckle in the 1980s or early 1990s and are experiencing new eye symptoms, the material itself may be worth investigating regardless of any upcoming MRI.
How MRI Imaging Is Affected by Buckle Materials
Even when a scleral buckle is perfectly safe from a magnetic standpoint, it can still affect the quality of the MRI images themselves. This is a separate issue from patient safety but one that matters to the radiologist trying to read your scan.
Research comparing how different ophthalmic surgical materials appear on both CT and MRI found that scleral buckling and retinopexy materials were each easily distinguishable from one another and from the normal anatomy of the eye on both types of imaging.5PubMed. MR imaging and CT of surgical materials currently used in ophthalmology: in vitro and in vivo studies That is good news for diagnosis: the buckle shows up clearly, and a trained radiologist can identify what it is without confusing it for a tumor or other abnormality. It also means the buckle does not create the kind of large signal void or “bloom” artifact that ferromagnetic metal implants cause, which can obscure entire regions of an image.
Silicone buckles appear with a distinct, recognizable signal on MRI sequences. They do not distort the surrounding anatomy in the way that, say, a titanium plate near the skull might. If your MRI is being ordered to evaluate the eye itself or the orbit, the radiologist will be able to work around the buckle’s appearance. If the MRI is for an entirely unrelated body part, the buckle will not affect the images at all.
Other Ophthalmic Implants and the MRI Question
Scleral buckles are not the only eye-related implants that come up during MRI screening. Intraocular lens implants, orbital floor plates, glaucoma drainage devices, and retinal tacks are all encountered in patients who need MRI scans. Each has its own safety profile that depends on its material composition.
Intraocular lens implants, for example, are typically made of acrylic or silicone and are non-ferromagnetic. They are generally safe for MRI, though they can be difficult to even see on the images.5PubMed. MR imaging and CT of surgical materials currently used in ophthalmology: in vitro and in vivo studies Newer magnetic ophthalmic implants are being developed for some applications, and these do interact with the MRI field. Testing of one such magnetic implant at 3 Tesla found that the translational force from the MRI magnet was about ten times the weight of the device, and the implant experienced significant torque. However, the surrounding tissue and sutures withstood far more force than the magnet produced, providing a large safety margin.6PubMed. Evaluation of the static magnetic field interactions for a newly developed magnetic ophthalmic implant at 3 Tesla MRI That kind of implant-specific testing is how manufacturers establish whether a device can be labeled safe for MRI.
The broader point is that “ophthalmic implant” is not one category for MRI purposes. Each device must be evaluated individually based on what it is made of, where it sits in or on the eye, and how it interacts with the specific field strength of the scanner being used.
What to Tell Your MRI Team
Before any MRI, you will be asked to complete a screening questionnaire that asks about implants, devices, and prior surgeries. This pre-scan screening process exists specifically to catch situations where an implant might be unsafe, and thorough screening protocols have been developed as standard practice for MRI facilities.7Wiley Online Library. Pre-MRI Procedure Screening: Recommendations and Safety Considerations for Biomedical Implants and Devices If you have a scleral buckle, mention it on the form and in conversation with the technologist. The key pieces of information that help the MRI team make a decision are:
- Material: Silicone rubber, silicone sponge, or another specific material if you know it.
- Date of surgery: Helps the team estimate which generation of materials was likely used.
- Metallic components: Whether clips or bands were used, and if so, what metal they were made of.
- Operative report: If you can obtain a copy from the surgeon or hospital, it typically lists the specific implant used, sometimes including a manufacturer and model number that the MRI team can look up in device safety databases.
If you had a standard silicone buckle with no metallic components, the conversation will usually be brief. The technologist will note the implant and proceed. If there is any uncertainty about the material, particularly regarding metallic elements, expect the facility to pause and verify before scanning. This is not an overreaction on their part. It is exactly the process that keeps MRI safe for everyone with implants.
When Records Are Incomplete or Unavailable
One of the trickiest real-world situations is the patient who had scleral buckling surgery decades ago and cannot locate the operative report. The surgeon may have retired, the hospital may have purged old records, or the patient may not remember details of the procedure. This happens more often than you might expect, especially with a surgery that was performed in the 1970s or 1980s when documentation practices were less standardized.
In these cases, the MRI team has a few options. A plain X-ray or CT scan of the orbits can sometimes identify whether metallic components are present around the eye. Metal shows up brightly and unmistakably on CT, so even a quick low-dose scan can rule out ferromagnetic clips. If no metal is visible, the risk profile shifts heavily in favor of safety. Some facilities will proceed with the MRI at that point, while others may still want a more definitive answer.
If the MRI is medically urgent and the buckle material cannot be determined, the treating physician and the radiologist will weigh the risk of not getting the scan against the small residual risk of scanning with an unknown implant. For most scleral buckles, the overwhelming probability is that the device is silicone and entirely safe. But medicine does not run on probabilities alone when patient safety is at stake, so expect the team to take whatever steps are available to confirm before proceeding.
Newer Buckle Designs and Future Directions
Scleral buckling technique continues to evolve. Newer approaches include foldable capsular buckles that use a balloon-like design filled with saline solution to create the indentation effect on the eye wall, replacing the traditional solid silicone element.8PubMed Central. Efficacy of scleral buckling for the treatment of rhegmatogenous retinal detachment using a novel foldable capsular buckle These devices are made from biocompatible polymers and saline, meaning they add no new MRI safety concerns.
The overall trend in ophthalmic implant design has been away from materials that could pose MRI problems. The shift from metal fixation clips to suture-only techniques, and the continued dominance of silicone as the primary buckle material, mean that the pool of patients who need to worry about MRI and their scleral buckle is shrinking over time. Most of the genuine uncertainty sits with patients who had surgery before the mid-1990s, when a wider variety of materials and techniques were in use, and with the small number of cases where metallic clips of uncertain composition were placed. For anyone who has had scleral buckling surgery in the last two decades with a standard silicone band or sponge, MRI safety is rarely a real obstacle.