New Parameter for Predicting the Postoperative IOL Position: Lens Equator Depth Assessed With Anterior Segment Optical Coherence Tomography
Purpose
We evaluated the efficacy of a new algorithm to predict the postoperative anterior chamber depth (ACD) using the lens equator depth (LED) assumed by anterior segment optical coherence tomography (OCT).
Methods
Sixty-one eyes that underwent phacoemulsification and IOL implantation of an One-piece plate haptic IOL between December 2013 and June 2014 were examined to develop the new algorithm for predicting the postoperative ACD. The lens equator depth (LED) was defined as the depth from the back surface of central cornea to the line connecting the crossing points between the anterior capsule and the posterior capsule measured intraoperatively using OCT in Catalys (Abbott Medical Optics). The postoperative ACD was measured in each case 1 month postoperatively and analyzed by multiple linear regression for covariance with preoperatively defined variables including the LED, the preoperative ACD (pre-ACD), the axial length (AL), and the corneal radius by the IOLMaster (Carl Zeiss Meditec).
Results
The mean pre-ACD was 2.71±0.50 mm (range, 1.75-3.36), LED 4.14±0.35 mm (range, 3.36-5.91), AL 23.97±1.37 mm (range, 21.89-27.63), and K 44.58±1.59 diopters (range, 38.25-46.75). Single regression analysis showed significant correlations between the postoperative ACD and LED, R2 = 0.701, P<0.001; pre-ACD, R2 = 0.57, P=0.001) Using the two most significant variables (LED and pre-ACD), the postoperative ACD was predictable according to a regression formula with an accuracy of 69.9% of the predictions. In the prospective study, the postoperative ACD was predicted with a correlation coefficient of 0.722.
Conclusion
Intraoperative measurement of the LED using anterior OCT of Catalys may be promising parameter to predict the postoperative lens position.