Glaucoma Implants and Eye Ointments: A Newly Identified Risk
New research from Nagoya University in Japan has identified a previously overlooked risk associated with widely used eye ointments. The study shows that petrolatum-based eye ointments can cause the PRESERFLO MicroShunt, a popular glaucoma implant, to swell and, in certain specific cases, rupture. Using both patient cases and laboratory testing, the researchers demonstrated that these ointments can compromise the device, currently used to treat glaucoma in more than 60 countries.
This is the first study to combine clinical observations with experimental evidence to clearly link petrolatum-based eye ointments to structural damage in this type of implant.
Understanding Glaucoma and the MicroShunt
Glaucoma is a chronic eye disease that damages the optic nerve, possibly leading to permanent vision loss. Elevated pressure inside the eye, caused by blocked fluid drainage, is a common culprit. Approximately 76 million people worldwide are affected by glaucoma.
The microshunt offers a treatment option. This tiny filtration device is surgically implanted to improve excess fluid drainage. compared to traditional glaucoma surgeries, the microshunt generally results in fewer post-operative complications and can reduce reliance on ongoing medication.
The Material Sensitivity of the MicroShunt
The MicroShunt is made from a styrenic thermoplastic elastomer – specifically, a polystyrene-block-polyisobutylene-block-polystyrene (SIBS) block polymer. This material was chosen for its versatility, biocompatibility, and low potential to cause inflammation or scarring within the eye.
However, this material is sensitive to contact with certain substances, including those found in petrolatum-based eye ointments.
How petrolatum Impacts the Implant
The research revealed that petrolatum, a common ingredient in many eye ointments, causes the SIBS polymer to swell. This swelling can lead to:
- Increased internal pressure within the MicroShunt.
- Structural deformation of the device.
- In severe cases, rupture of the implant.
Laboratory testing confirmed these findings, demonstrating a clear correlation between exposure to petrolatum and the degradation of the MicroShunt material.
Clinical Observations Support the Findings
Researchers analyzed cases of MicroShunt failure and identified a pattern: patients who used petrolatum-based eye ointments experienced a higher rate of implant complications.This clinical evidence, combined with the laboratory results, strengthens the link between the ointment and the implant damage.
What this Means for Patients
Patients with a MicroShunt implant should discuss their eye care routine with their ophthalmologist. Specifically, they should inquire about alternatives to petrolatum-based eye ointments, especially for nighttime use when the eyes are closed and exposure is prolonged.
Alternatives may include lubricating eye drops or ointments formulated with different ingredients.
Key Takeaways
- Petrolatum-based eye ointments can damage PRESERFLO MicroShunts.
- The SIBS polymer used in the MicroShunt is susceptible to swelling when exposed to petrolatum.
- Swelling can lead to implant failure and potential vision loss.
- Patients with MicroShunts should avoid petrolatum-based ointments and discuss alternatives with their doctor.
this research highlights the importance of considering the compatibility of medical devices with commonly used medications and eye care products. Future studies will focus on identifying safer alternatives to petrolatum-based ointments and developing more resilient implant materials to minimize the risk of complications for glaucoma patients.
