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• W2079715448 abstract "In the April 2001 issue, Durak et al.1 review the clinical characteristics, natural course, and treatment of 13 cases of early postoperative capsular block syndrome (CBS). They conclude that the etiology is unknown, but that viscoelastic material plays a major role. However, I would propose that the mechanism is iatrogenic and therefore preventable. I am certain that others have reached this same conclusion based on intraoperative observations similar to mine. Following final removal of a viscoelastic agent, the anterior chamber frequently shallows upon withdrawal of the irrigation/aspiration instrument. Forward movement of the intraocular lens (IOL) optic may cause 360 degrees of apposition with the capsulorhexis. The resulting “capsulo-pseudophakos” block is usually broken when the anterior chamber is reformed because the haptic angulation displaces the optic away from the capsulorhexis posteriorly. However, if the optic remains sealed against the entire capsulorhexis circumference while the chamber is reformed, the capsulo-pseudophakos block may persist. This is more likely if there is a significant amount of retained viscoelastic material behind the optic. This mechanical block creates the 2 anatomic hallmarks of CBS. First, the optic will remain in a more anterior position than intended, with a resultant myopic shift. Second, fluid and viscoelastic material are unable to escape past this hermetic seal and will remain trapped in the capsular bag behind the optic. Given this etiology, I agree with the authors that “CBS is independent of IOL design and material.” Being aware of this mechanism allows us to observe a temporary state of CBS during the chamber reformation step. Intraoperative reversal and prevention of this unwanted anatomy is straightforward. While reforming the shallow chamber with balanced salt solution (BSS®) injected through a 45-degree #30 cannula, one can nudge and displace the IOL optic posteriorly with the cannula tip. This breaks the capsulorhexis/optic seal and allows the IOL optic to fall back into its intended posterior position. Similar to many others, I first experienced this complication soon after adopting the capsulorhexis technique.2 Since recognizing the mechanism and learning to prevent it, I have not had a single case of CBS in more than 7000 cases. David F. Chang MD aLos Altos, California, USA" @default.
• W2079715448 created "2016-06-24" @default.
• W2079715448 creator A5085819883 @default.
• W2079715448 date "2001-10-01" @default.
• W2079715448 modified "2023-09-25" @default.
• W2079715448 title "Etiology of Capsular Block Syndrome" @default.
• W2079715448 cites W2017294008 @default.
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• W2079715448 doi "https://doi.org/10.1016/s0886-3350(01)01148-8" @default.
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