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N. Brar, K. J. Warrian, S. L. Cremers; Capsular Tension Rings Increase Refractive Predicted Error. Invest. Ophthalmol. Vis. Sci. 2007;48(13):1087.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the effect of capsular tension rings (CTR) on refractive predicted error in patients having phacoemulsification cataract surgery.
All cataract extraction cases requiring theuse of a CTR from 2002 to present were retrospectively reviewed using a cataract outcomes database of 2175 cases. 16 cases utilizing a Morcher CTR were identified. All CTR cases were reviewed for pre-operative and post-operative BCVa and refraction. They were also reviewed for the cause of zonular instability, comorbid ocular conditions, axial length (AL) and anterior chamber depth (ACD) measurements. The CTR cases were compared with a control population of 16 uncomplicated cases where a CTR was not needed. Controls were age-, sex-, and surgeon-matched. Main outcome measures were mean arithmetic and absolute refractive predicted errors (ArRPE and AbRPE).
Statistically significant differences were found between the CTR and control groups with respect to both ArRPE and AbRPE. The CTR group had a significantly greater ArRPE (1.22 + 1.01) and AbRPE (1.24 + 0.98) in comparison to the control group's ArRPE (0.48 + 0.60), (p<0.05) and AbRPE (0.62 + 0.44), (p<0.05). No significant differences existed between the CTR and control groups with respect to the variance of ArRPE or AbRPE. In addition, no significant differences between the preoperative AL and ACD were noted between the two groups.
The use of a Morcher CTR during cataract surgery is associated with increased refractive predictive error.
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