Morcher Capsular Tension Ring
The CTR is a PMMA open-ring device with blunt tipped eyelets at either end. The CTR is designed to be implanted into the capsular bag and left permanently in place. CTRs work by imparting a radial expansile force to the equator of the capsular bag. This force is equalized throughout the entire zonula-capsule apparatus, thereby transferring the tension from intact and normal zonules to those areas of zonular weakness or absence. By increasing overall bag stability, the risk of intraoperative complications is reduced. In addition, the tension imparted to the entire bag with a CTR decreases postoperative capsular contraction (phimosis) and improves IOL centration. CTRs have no effect on the refractive results of cataract surgery. Whether or not a CTR will decrease the rate of late IOL/bag subluxation is still being evaluated and debated. In order to be most effective, the CTR should be larger in diameter than the capsular bag. Ultrasound biomicroscopy has shown that a correctly placed CTR lies between the IOL haptic and the ciliary body with no iris touch and that its position is stable, safe and consistent.
The CTR is a PMMA open-ring device with blunt tipped eyelets at either end. The CTR is designed to be implanted into the capsular bag and left permanently in place. CTRs work by imparting a radial expansile force to the equator of the capsular bag. This force is equalized throughout the entire zonula-capsule apparatus, thereby transferring the tension from intact and normal zonules to those areas of zonular weakness or absence. By increasing overall bag stability, the risk of intraoperative complications is reduced. In addition, the tension imparted to the entire bag with a CTR decreases postoperative capsular contraction (phimosis) and improves IOL centration. CTRs have no effect on the refractive results of cataract surgery. Whether or not a CTR will decrease the rate of late IOL/bag subluxation is still being evaluated and debated. In order to be most effective, the CTR should be larger in diameter than the capsular bag. Ultrasound biomicroscopy has shown that a correctly placed CTR lies between the IOL haptic and the ciliary body with no iris touch and that its position is stable, safe and consistent.
The CTR is a PMMA open-ring device with blunt tipped eyelets at either end. The CTR is designed to be implanted into the capsular bag and left permanently in place. CTRs work by imparting a radial expansile force to the equator of the capsular bag. This force is equalized throughout the entire zonula-capsule apparatus, thereby transferring the tension from intact and normal zonules to those areas of zonular weakness or absence. By increasing overall bag stability, the risk of intraoperative complications is reduced. In addition, the tension imparted to the entire bag with a CTR decreases postoperative capsular contraction (phimosis) and improves IOL centration. CTRs have no effect on the refractive results of cataract surgery. Whether or not a CTR will decrease the rate of late IOL/bag subluxation is still being evaluated and debated. In order to be most effective, the CTR should be larger in diameter than the capsular bag. Ultrasound biomicroscopy has shown that a correctly placed CTR lies between the IOL haptic and the ciliary body with no iris touch and that its position is stable, safe and consistent.
