Effect of trabeculectomy on the accuracy of intraocular lens calculations in patients with open-angle glaucoma.

BACKGROUND

The objective of the study is to examine the effect of trabeculectomy on intraocular lens power calculations in patients with open-angle glaucoma (OAG) undergoing cataract surgery.

DESIGN

The design is retrospective data analysis.

PARTICIPANTS

There are a total of 55 eyes of 55 patients with OAG who had a cataract surgery alone or in combination with trabeculectomy.

METHODS

We classified OAG subjects into the following groups based on surgical history: only cataract surgery (OC group), cataract surgery after prior trabeculectomy (CAT group), and cataract surgery performed in combination with trabeculectomy (CCT group).

MAIN OUTCOME MEASURES

Differences between actual and predicted postoperative refractive error.

RESULTS

Mean error (ME, difference between postoperative and predicted SE) in the CCT group was significantly lower (towards myopia) than that of the OC group (P = 0.008). Additionally, mean absolute error (MAE, absolute value of ME) in the CAT group was significantly greater than in the OC group (P = 0.006). Using linear mixed models, the ME calculated with the SRK II formula was more accurate than the ME predicted by the SRK T formula in the CAT (P = 0.032) and CCT (P = 0.035) groups.

CONCLUSIONS

The intraocular lens power prediction accuracy was lower in the CAT and CCT groups than in the OC group. The prediction error was greater in the CAT group than in the OC group, and the direction of the prediction error tended to be towards myopia in the CCT group. The SRK II formula may be more accurate in predicting residual refractive error in the CAT and CCT groups.