Swept-source OCT reduces the risk of axial length measurement errors in eyes with cataract and epiretinal membranes

Abstract

Aims To compare the biometric data from partial coherence interferometry (PCI) and swept-source OCT (SS-OCT) in patients with age-related cataract and epiretinal membrane (ERM): ERM, ERM with foveoschisis and macular pseudohole. Methods 49 eyes of 49 subjects including 36 ERM, 9 ERM foveoschisis and 4 macular pseudohole were analysed to evaluate the axial length (AL) measurements and the presence of AL measurement errors, defined basing on the shape of the biometric output graphs and on the concordance of AL values between instruments. Eyes with ERM were divided in four stages according to OCT features (i.e. presence/absence of the foveal pit, presence of ectopic inner foveal layers, disrupted retinal layers). Results The devices provided similar mean AL measurements in all subgroups, with differences <0.1 mm in 41/49 cases (83.6%). AL measurement errors were observed in ERM stages 3 and 4, characterized by ectopic inner foveal layers, and were significantly more frequent with the PCI (8/17, 47%) as compared with the SS-OCT device (2/17, 12%), p = 0.02. The refractive prediction error in cases with AL measurement errors was significantly greater using the PCI compared to the SS-OCT device (p<0.05). Conclusion Both devices provide reliable biometric data in the majority of patients and can be used in the preoperative assessment of patients with age-related cataract and ERM. In eyes with ectopic inner foveal layers, attention should be paid as AL measurement and refractive prediction errors may occur, more frequently with the PCI device.

Short-term clinical outcomes after implantation of monofocal intraocular lens with enhanced intermediate function in eyes with epiretinal membrane

“…When measuring the axial length using partial coherence interferometry, it has been reported that an error in measurement occurs because of the change in reflectivity in presence of ERM 23 , 24 . However, another study reported that both partial coherence interferometry and swept source OCT-based biometer showed relatively accurate axial length measurements 25 . In our study using another swept source OCT-based biometer, the average spherical equivalent at 1 month after surgery was within -0.5 D in all groups, showing accurate IOL power calculation results despite the existence of a varying degree of ERM.…”

Refractive error after combined phaco-vitrectomy: A multicentric study

“…8–10 On the other hand, there is some evidence suggesting that calculations made using swept-source optical coherence tomography are more reliable. 11…”

“…[8][9][10] On the other hand, there is some evidence suggesting that calculations made using swept-source optical coherence tomography are more reliable. 11 The aim of this multicentric study was to point out the RE after combined phaco-vitrectomy using optical biometry and to determine which IOL-power formula (among SRK-T, Olsen's and Holladay-2) would be more precise in these cases.…”