Refractive Changes in Pseudophakic Eyes Following Vitrectomy With or Without Gas Tamponade

This research was reviewed by an independent ethical review board and conforms with the principles and applicable guidelines for the protection of human subjects in biomedical research. This was a retrospective, comparative case series including pseudophakic patients who underwent PPV. Group 1 consisted of patients with pseudophakic RRD who underwent PPV and 12% perflouropropane (C3F8) gas tamponade whereas Group 2 consisted of patients with ERM or VH who underwent PPV without any tamponade between February 2015 and March 2019 at Bursa Retina Eye Hospital. Informed consent was obtained from all the participants. The study was in line with the ethical standarts of the Helsinki Declaration

Patient eligibility Patients who underwent uncomplicated cataract surgery with phacoemulsification and in-the-bag IOL implantation and subsequent neodymium:yttrium-aluminum-garnet (Nd:YAG) laser due to capsular opacification were included. Preoperative refractive data obtained after Nd:YAG laser and six months prior to vitrectomy surgery. Postoperative refractive data was obtained at 12 months after vitrectomy. Eyes with a preoperative spherical refractive error > ±6 D or cylindrical refractive error > ±3 D were excluded. Also eyes with corneal disorders were excluded.

Ocular parameters

All patients underwent complete ophtalmic examination including best corrected visual acuity (BCVA) in the logMAR scale, slit-lamp examination, intraocular pressure (IOP) assessment, fundus examination and autokeratorefractometry (auto kerato-refractometer KR-8800 from Topcon, Tokyo, Japan) at preoperative and postoperative month-12. Induced astigmatism values were calculated through vector analysis.

Surgical procedures