Standard soft contact lenses made from hydrogel or silicone hydrogel are generally safe to wear during an MRI scan. They contain no metal and will not be pulled, heated, or damaged by the magnetic field. That said, many MRI facilities still ask you to remove all contact lenses before a scan, and there are good reasons for that blanket policy. Cosmetic and decorative lenses, rigid lenses, and certain specialty products blur the safety picture enough that “just take them out” is the simplest rule for a busy imaging center to enforce.
Why Most Facilities Tell You to Remove Them Anyway
If plain soft contacts are safe, you might wonder why the technologist hands you a lens case and tells you to take them out. The short answer is that MRI staff cannot easily tell what kind of lens you are wearing just by looking at your eyes. A standard clear daily disposable and a cosmetic “circle” lens designed to enlarge the appearance of the iris look quite different under magnification, but to a technologist doing a quick screening, they can look identical. Some cosmetic lenses contain metallic pigments in their tinted outer ring, and those pigments interact with the MRI’s magnetic field. A study using gelatin phantoms found that circle contact lenses produced susceptibility artifacts on MR images consistent with the metallic content of their extra-wide decorative rim. After eight minutes of scanning, the circle lenses showed a temperature rise of 1.0 degree Celsius. While the lenses were not physically deformed or displaced, the researchers concluded that removal of all contact lenses before an MRI examination should continue to be enforced, since it is the only realistic way to prevent patients from being scanned while still wearing cosmetic lenses that staff might not recognize.1PubMed Central. Incidental discovery of circle contact lens by MRI: you can’t scan my poker face, circle contact lens as a potential MRI hazard
The blanket removal policy is essentially a workaround for an information problem. If every patient could reliably tell the technologist exactly what their lenses are made of, the rule could be more nuanced. In practice, many patients do not know whether their colored or cosmetic lenses contain metallic components, and some do not even mention they are wearing contacts at all. A universal “remove them” policy eliminates the guesswork.
What Makes Cosmetic and Colored Lenses Different
Standard prescription soft lenses are made of water-absorbing polymer with no metallic ingredients. Their optical properties come from the curvature of the lens, not from embedded pigments. Cosmetic lenses, on the other hand, achieve their color or iris-enlarging effect by incorporating pigments into or onto the lens material. Some of those pigments are iron-oxide-based, and iron oxide is ferromagnetic, which means it responds to a strong magnetic field.
A phantom study examining different types of contact lenses in an MRI scanner found that lenses produced visible susceptibility artifacts on the resulting images. Interestingly, the study reported that contact lenses from an authorized seller caused more visible artifacts than those from an unauthorized vendor, suggesting that the composition and manufacturing process of the pigments vary considerably between products.2Journal of Medical Imaging and Radiation Sciences. Susceptibility Artefact cause by Different Types of Contact Lenses in MRI Brain: A Phantom Study The implication is that you cannot assume a cosmetic lens is MRI-safe just because it comes from a reputable brand, and you certainly cannot assume safety from an unregulated product bought online.
The concern with metallic pigments in the MRI environment is threefold. The magnetic field can exert a small force on ferromagnetic particles, potentially causing the lens to shift on the eye. The rapidly switching gradient fields and radiofrequency energy used during scanning can heat metallic components. And even if the patient feels nothing, the metallic content can distort the MR images in ways that obscure the very anatomy the scan is trying to visualize. For a brain MRI or an orbital scan, artifacts from a cosmetic lens sitting right on the eye can compromise diagnostic quality in the region that matters most.
Rigid Gas Permeable and Hard Lenses
Rigid gas permeable (RGP) lenses, sometimes still called “hard” contacts, present a different set of considerations. These lenses are made from firm, oxygen-permeable plastics and do not contain metallic pigments. They are not ferromagnetic and will not be attracted to the magnet. However, the MRI environment involves lying still in a confined space, often for 30 to 60 minutes, and rigid lenses can become uncomfortable during prolonged periods without blinking or with the eyes closed. The drying effect alone is reason enough for most practitioners to recommend removal.
An unusual property of RGP lenses in MRI is that the lens material itself is essentially invisible to the scanner. A case report documented a rigid gas permeable lens that had migrated into a patient’s upper eyelid after trauma and remained embedded for seven years. MRI scans did not detect the lens directly but did detect proteinaceous cysts that had formed around it, along with swelling of the surrounding tissues.3PubMed Central. A rigid gas permeable contact lens discovered embedded in the upper eyelid 7 years after trauma: A case report This means that if you accidentally leave an RGP lens in during a scan, it will not cause image artifacts the way a cosmetic lens might, but it also means that a lost or displaced RGP lens will not show up on MRI if someone is looking for it.
What Actually Happens to Your Eyes During a Scan
The MRI machine produces three things that matter for anything on or near your body: a strong static magnetic field (typically 1.5 or 3 Tesla in clinical scanners), rapidly switching magnetic gradient fields, and radiofrequency (RF) energy pulses. Each of these interacts differently with materials.
For a standard soft contact lens with no metallic content, none of these three forces does anything meaningful. The lens is made of polymer and water, both of which are essentially transparent to the magnetic field. The RF pulses deposit energy into tissue, which is why you feel warm during a long scan, but the amount of heating in a thin water-containing lens is negligible and roughly the same as the heating in the tear film itself.
With a cosmetic lens containing iron-oxide pigments, the static magnetic field can exert a small translational force and torque on the metallic particles. The RF pulses can cause localized heating around those particles. The degree of each effect depends on the concentration of metal, the size of the particles, and the strength of the scanner. At 1.0°C of measured temperature rise in the circle-lens phantom study, the heating was modest but not zero.1PubMed Central. Incidental discovery of circle contact lens by MRI: you can’t scan my poker face, circle contact lens as a potential MRI hazard Whether that degree of warming would cause discomfort or corneal damage in a living eye over a longer scan is not well studied, which is precisely why the cautious approach wins out.
Image Artifacts and Why Radiologists Care
Even if a contact lens does not physically harm you, it can still ruin the scan. This matters most when the MRI is focused on the head, brain, orbits, or sinuses. Metallic components in a lens create dark voids or bright spots on the images, called susceptibility artifacts, that spread beyond the lens itself and can obscure nearby structures. If you are getting an MRI of your knee, a cosmetic contact lens is unlikely to affect image quality. If you are getting a brain MRI to evaluate headaches or a dedicated orbital scan to assess an eye condition, even a small artifact near the anterior eye can mask something diagnostically relevant.
The phantom study on different lens types confirmed that the artifacts varied in size and intensity depending on the specific product.2Journal of Medical Imaging and Radiation Sciences. Susceptibility Artefact cause by Different Types of Contact Lenses in MRI Brain: A Phantom Study For radiologists, this unpredictability is the core problem. A lens that produces a small artifact in one scanner might produce a larger one in a higher-field-strength machine or with a different pulse sequence. Rather than trying to catalog every lens brand and its MRI behavior, it is far simpler to ask patients to remove all lenses.
The Bigger Safety Concern With Eyes and MRI
Contact lenses get a lot of attention in pre-scan screening, but the real eye-related danger in MRI involves metallic foreign bodies lodged inside the eye itself. People who have worked with metal, such as welders, grinders, or machinists, can have tiny ferromagnetic fragments embedded in the eye without knowing it. When exposed to a powerful magnetic field, these fragments can move, potentially tearing delicate intraocular structures and causing bleeding or vision loss.
A documented case involved a 47-year-old man with an undetected ferromagnetic metallic foreign body in his right eye who underwent elective MRI scans for chronic neck and back pain. After the scans, he developed blurred vision caused by bleeding in the front chamber of the eye. The presentation was subtle enough that it could easily have been missed or attributed to something else. The case authors noted that while such injuries are rare, the consequences can be severe, and standard pre-MRI screening questionnaires do not always catch patients with occult metallic foreign bodies.4PubMed. Undetected intraocular metallic foreign body causing hyphema in a patient undergoing MRI: a rare occurrence demonstrating the limitations of pre-MRI safety screening
This is worth understanding because it puts the contact lens question in perspective. A standard soft contact lens poses essentially no risk. A cosmetic lens poses a small, mostly theoretical risk of minor heating and a practical risk of image artifacts. A metallic foreign body inside the eye poses a real risk of acute injury. The screening questionnaire you fill out before an MRI is primarily designed to catch the last category, and the contact lens question is a lower-stakes add-on.
Magnetic Eyelashes and Other Cosmetic Items Near the Eyes
Contact lenses are not the only cosmetic product that patients sometimes forget to mention before an MRI. Magnetic eyelashes, which have become popular in recent years, use small magnets embedded in strips of false lashes to hold them in place without adhesive. These magnets are ferromagnetic by design, and researchers have evaluated their safety in MRI scanners. A study tested commercially available magnetic eyelashes in a 3-Tesla MRI scanner, measuring displacement force, torque, and RF-induced heating according to established testing standards.5PubMed Central. Magnetic resonance safety assessment of a new trend: magnetic eyelashes The concern is straightforward: a small magnet sitting on your eyelid could be pulled by the scanner’s field, potentially causing injury to the eye or eyelid, and the RF energy could heat the metallic component against the skin.
Permanent cosmetic tattoos around the eyes can also interact with MRI fields if the ink contains iron oxide, which many do. A systematic review and lab study examining keratopigmentation, a procedure where pigment is placed directly in the cornea, found that iron-oxide-based inks produced artifacts that significantly inhibited analysis of the eye on MR images. Under normal MRI conditions, subtle pigment migration was observed with iron-oxide inks, and under stronger-than-normal exposure, the migration became pronounced and visible both to the naked eye and under a microscope.6PubMed. Magnetic Resonance Imaging and Keratopigmentation: A Systematic Review and Ex Vivo Study of Complications and Adverse Events This is a niche concern, since keratopigmentation is still uncommon, but it illustrates how any iron-containing material near the eye deserves attention in the MRI setting.
Practical Steps Before Your Scan
If you wear standard prescription soft contacts and have an MRI scheduled, the easiest path is to simply wear your glasses to the appointment instead. You will need to remove glasses before the scan anyway (metal frames and hinges), but at least you will not need a lens case, solution, or a way to reinsert your lenses in an unfamiliar restroom. If you forget and arrive wearing contacts, most facilities have lens cases available or can provide a small cup with saline.
If you wear daily disposables, you can remove them and discard them before the scan, then put in a fresh pair afterward. This avoids any concern about contamination from handling lenses in a clinical environment. If you wear extended-wear or monthly lenses, bring your case and solution.
For anyone wearing colored, cosmetic, or circle lenses, removal is not optional. These should come out regardless of which body part is being scanned, because the screening staff typically applies the same protocol across all exam types. The same goes for magnetic eyelashes and any other removable cosmetic item containing metal near the face.
If you are in an emergency situation and cannot communicate whether you are wearing contacts, or if the clinical team cannot safely remove them, standard soft lenses are unlikely to cause a problem. Emergency MRI protocols prioritize getting the diagnostic information needed, and the risk profile of a plain soft lens is low enough that it would not typically delay an urgent scan. The circle-lens study specifically pointed out that emergency and unconscious patients present the hardest screening challenge, because no one can ask them what is on their eyes.1PubMed Central. Incidental discovery of circle contact lens by MRI: you can’t scan my poker face, circle contact lens as a potential MRI hazard
Dry Eyes During and After the Scan
One concern that rarely makes it into safety discussions but matters to contact lens wearers is comfort. MRI scanners blow air through the bore to keep the patient cool, and the scanning environment is climate-controlled in a way that tends to be dry. If you are lying still with your eyes closed for 20 to 45 minutes, the tear film under a contact lens can evaporate more than it would during normal blinking. Soft lens wearers sometimes report that their lenses feel tight or dry after a scan, even though nothing hazardous has happened.
This is not a safety issue so much as a quality-of-life one. If you already deal with dry eyes or find your lenses uncomfortable by late afternoon, adding a period of sustained eye closure in a dry environment can make things worse. Bringing rewetting drops to use after the scan is a reasonable precaution if you choose to keep your lenses in, though again, the simplest solution is just to wear glasses that day.
For people who wear scleral lenses, which are large rigid lenses that vault over the cornea and rest on the white of the eye, the fluid reservoir between the lens and the cornea actually helps prevent drying. Scleral lenses are made of the same gas-permeable polymers as standard RGP lenses and contain no metallic components. Whether to remove them before a scan is worth discussing with your MRI facility, since scleral lenses are harder to insert and remove than standard contacts, and taking them out in an unfamiliar setting can be stressful for patients who rely on them for conditions like keratoconus or severe dry eye.