The role of the vitreous body in effective IOL positioning
To compare the effective lens position (ELP) after phaco surgery alone and after combined phacovitrectomy surgery.
Twenty patients who were scheduled for elective surgery in both eyes were included. In one eye, phacovitrectomy surgery was performed (without any tamponade), and in the fellow eye, only phaco surgery was performed using the same IOL type. Pre- and postoperative biometric measurements were performed using laser interference biometry. The postoperative anterior chamber depth (ACD) was measured to determine the ELP. The primary outcome measure was the difference in the postoperative ACD between both eyes.
The postoperative ACD following phacovitrectomy showed a statistically significant increase compared with that following phaco surgery alone, indicating a more posterior position of the IOL.
An adjusted ELP parameter to optimize IOL calculation may be useful in eyes undergoing combined phacovitrectomy sugergy.
KeywordsEffective lens position Phacovitrectomy Postoperative anterior chamber depth IOL power calculation formulas
Compliance with ethical standards
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study. The study was registered at the Ethics Committee of the University Hospital Leuven prior to patient inclusion. Registration number ELP20160105. January 2016.
Conflict of interest
Peter Stalmans is a consultant for Bausch + Lomb, DORC, Nano-Retina, Ophtec, Vitreq and Zeiss, received speaker fees from AMO and received a research grant from Thrombogenics.
- 5.Byrne S, James Ng, Hildreth A, Danjoux J-P, Steel D.(2008) Refractive change following pseudophakic vitrectomy. BMC Ophthalmol 8:19Google Scholar
- 10.Seo S, Seong MC, Lim HW, Kang MH, Cho HY (2013) The changes of anterior chamber depth, axial length, refractive errors after combined vitrectomy. J Korean Opthalmol Soc 54(7):1021–1037Google Scholar
- 13.Jiang Y, He X, Ting Lee M-L, Rosner B, Yan J.(2017) Wilcoxon rank-based tests for clustered data with R package clusrank. https://arxiv.org/pdf/1706.03409.pdf. Accessed 8 Aug 2017