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What is capsular tension segment?

The Capsular Tension Segment. The capsular tension segment (CTS) was designed with these considerations in mind. The device, also made of PMMA, is a partial ring design spanning 90 degrees with a raised single eyelet centrally, which is designed to sit anterior to the anterior capsule (Figure 2).

What is the capsular tension ring (CTR)?

Introduction The capsular tension ring (CTR) was first described in 1991 by Hara and coauthors (1991). They named it an “equator ring”, designed to maintain the circular contour of the capsular bag after lens removal during cataract surgery. However, their flexible silicon ring did not adapt to the different capsular bag sizes.

What are the different types of capsular tension devices?

These devices consist of capsular tension rings, modified capsular tension rings, capsular tension segments, and capsular retention hooks (Figure 1). Figure 1: A) Capsular tension ring, B) Modified capsular tension ring, C) Capsular tension segment, D) Capsular retention hook. Source: Morcher GmbH, Stuttgart, Germany.

When are capsular tension rings not enough?

A standard capsular tension ring alone may not be adequate for eyes with advanced zonular weakness, more than 4 clock hours of zonular loss, or progressive zonulopathy. Such eyes require endocapsular devices that can be scleral fixated, such as modified capsular tension rings or capsular tension segments.

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