Swiss Federal Institute of Technology, Lausanne, Switzerland.
Swiss Visio, Montchoisi Clinic, Lausanne, Switzerland.
Eur J Ophthalmol. 2022 Jan;32(1):NP79-NP82. doi: 10.1177/1120672120973617. Epub 2020 Nov 13.
The eyeWatch is a new glaucoma drainage device that includes an adjustable mechanism that can vary the resistance to aqueous humor outflow during the postoperative period to reduce the burden of postoperative intraocular pressure (IOP) management. The mechanism contains a magnetic rotor that can be adjusted using an external magnetic control unit. Adjustments of the position of the rotor are performed mostly in the initial postoperative follow-up period in order to reach the target IOP. However, for some patients, it might be necessary to perform MRI for the sake of medical investigations. As the MRI is creating a strong magnetic field, this magnetic field is likely to interact with the adjustable rotor of the eyeWatch, resulting in modification of the IOP. We report the case of an 82-old female patient successfully operated with the implantation of an eyeWatch. The patient underwent a cerebral MRI for persistent headache. Shortly after the MRI procedure, the patient was checked at the eye clinic to assess the position of the rotor and to measure the IOP. The eyeWatch was readjusted to the former position set before undergoing the MRI. No complications were reported in the follow-up after MRI. This case demonstrates that MRI examinations can be safely performed after glaucoma surgery using an eyeWatch without compromising on the quality of the imaging or the stability of the IOP. This is a complication-free procedure that only requires checking the new position of the rotor and re-adjusting the implant, if necessary, to achieve the target IOP.
眼内压监测仪是一种新型青光眼引流装置，包含一个可调节机制，可在术后改变房水流出阻力，以减轻术后眼压（IOP）管理负担。该机制包含一个可通过外部磁控单元进行调节的磁性转子。转子位置的调节主要在术后初期随访期间进行，以达到目标眼压。然而，对于某些患者，出于医疗检查的需要，可能需要进行 MRI。由于 MRI 会产生强磁场，这个磁场可能会与眼内压监测仪的可调转子相互作用，导致眼压发生变化。我们报告了一例成功接受眼内压监测仪植入的 82 岁女性患者的病例。该患者因持续性头痛接受了脑部 MRI 检查。MRI 检查后不久，患者在眼科诊所接受检查，以评估转子位置并测量眼压。眼内压监测仪被重新调整到 MRI 检查前的位置。MRI 检查后随访中未报告任何并发症。本病例表明，在青光眼手术后使用眼内压监测仪进行 MRI 检查是安全的，不会影响成像质量或眼压稳定性。这是一种无并发症的程序，仅需检查转子的新位置，并在必要时重新调整植入物，以达到目标眼压。
