Capsular Tension Ring
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A CTR is a 270 degree open PMMA ring placed in the capsular bag during cataract surgery in cases with zonular instability or weakness.
Capsular tension rings (standard type)
For cases involving less than 4 clock hours (4 positions) of zonular dialysis, a standard CTR is suitable.
Cionni rings with single and double loop.
For cases involving greater than 4 clock hours or progressive zonular damage.
Capsular tension segment.
Partial ring used in cases that cannot be supported by CTR.
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