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New Parameter for Predicting the Postoperative IOL Position: Preoperative Lens Equator Depth measured By Three‐Dimentional Anterior Segment Optical Coherence Tomography
Author(s) -
Hwang K.Y.,
Joo C.K.,
Yoon G.Y.
Publication year - 2015
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2015.0702
Subject(s) - phacoemulsification , optical coherence tomography , ophthalmology , lens (geology) , medicine , intraocular lens , cornea , optics , visual acuity , physics
Purpose To test the hypothesis that the preoperative crystalline lens equator depth (pre‐ LED ) measured by three‐dimensional anterior segment optical coherence tomography ( OCT ) is an effective predictor of the postoperative anterior chamber depth (post‐ ACD ). Methods Thirty‐nine eyes that underwent phacoemulsification and implantation of a one‐piece, plate‐haptic intraocular lens between December 2013 and June 2014 were examined to develop the new algorithm for predicting the post‐ ACD . The pre‐ LED was defined as the depth from the back surface of central cornea to the line connecting the intersecting points between the anterior and posterior capsule intraoperatively using 3‐D OCT in Catalys (Abbott Medical Optics). The post‐ ACD was measured by Pentacam (Oculus) in each case at 2 months postoperatively and was analyzed by multiple linear regression for covariance with preoperatively defined variables including the pre‐ LED , lens thickness, lens vaulting measured by the OCT and the preoperative ACD (pre‐ ACD ) measured by the OCT and Pentacam. Results The mean pre‐ ACD , pre‐ LED , AL , lens thickness and lens vaulting was 2.74 ± 0.50 mm (range, 1.75–3.36); 4.14 ± 0.35 mm (range, 3.36–5.91); 23.97 ± 1.37 mm (range, 21.89–27.63), 4.23 ± 0.46 mm (range, 3.01–5.12) and 1.42 ± 0.27 mm (range, 0.82–1.89). Single regression analysis showed significant correlations between the post‐ ACD and pre‐ LED , R 2 = 0.468, P < 0.001; pre‐ ACD , R 2 = 0.379, P < 0.001) Using a new regression formula with the two most significant variables (pre‐ LED and pre‐ ACD ), the post‐ ACD can be predicted with an accuracy of 47.3%. In the prospective study, the postoperative ACD was predicted with a correlation coefficient of 0.696. Conclusions The crystalline lens equator depth may be a promising preoperative parameter to predict the postoperative IOL position.