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Prediction of the true IOL position in children with paediatric cataract using anterior segment optical coherence tomography

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First Author: C.Ping Jun CHINA

Co Author(s):    Z. Yun-e                    

Abstract Details

Purpose:

To find out the relationship between the true postoperative IOL position and ELP using different formulas. To establish an accurate formula to estimate the true postoperative IOL position in terms of the available parameters.

Setting:

Accurate prediction of ELP plays a crucial role in selection of a suitable IOL. For exact calculations, the true position of the IOL is required, and latest optical coherence (OCT) technology accurately and reproducibly measures the anterior segment of the eye.

Methods:

In this prospective study, 38 eyes with congenital cataracts in 38 children were enrolled. The effective lens position (ELP) predicted values of different formulas were obtained by routine preoperative examination Surgical methods and procedures included lensectomy combined with limited anterior vitrectomy with in the bag intraocular lens implantation. One month after the surgery, the swept-source optical coherence tomography (SS-OCT) was used to measure the actual IOL position.

Results:

The middle lens position (mLP) was 4.75±0.41mm, was significantly correlated with preoperative axial length (P = 0.023) and preoperative anterior chamber depth (ACD) (P = 0.007). There was significant difference between the measured mLP and ELP(SRK/T P = 0.000). The regression coefficients for anterior chamber depth ACD, in prediction of anterior IOL position were found: mLP = 0.358 × ACD + 3.62(p = 0.007). The refractive error calculated using the Haigis formula was significantly smaller than the SRK/T (P ＜ 0.01), as ΔELP SRK/T-mLP was significantly greater than ΔELP Haigis -mLP (P ＜ 0.01).

Conclusions:

The true postoperative IOL position were analyzed and compared with the value predicted by the formulas. An mLP prediction formula with only ACD parameter is obtained as: mLP = 0.358 × ACD + 3.62. By comparison, Haigis formula is more advantageous in predicting the actual location of the intraocular lens after surgery in children with congenital cataract.

Financial Disclosure:

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