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Comparison of swept-source OCT-assisted biometry and A-scan-based biometry in patients with rhegmatogenous retinal detachment, without macular involvement

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Session Details

Session Title: Glaucoma & Posterior Segment

Session Date/Time: Monday 24/09/2018 | 08:00-10:30

Paper Time: 10:06

Venue: Room A3, Podium 1

First Author: : S.Freissinger GERMANY

Co Author(s): :    E. Vounotrypidis   J. Langer   D. Muth   S. Priglinger   W. Mayer        

Abstract Details


To evaluate validity of axial length, anterior chamber depth and lens thickness measurements of a swept source OCT-assisted biometer in comparison to an a-scan based biometer for refractive outcome in term of phacovitrectomy.


University Eye Hospital, Ludwig-Maximilians-University, Munich, Germany.


83 eyes of 83 patients with age related cataract and rhegmatogenous retinal detachment (RRD) underwent combined micro-incision cataract surgery and 23g vitrectomy. Objective and manifest refraction, CDVA, swept-source OCT-assisted biometry, A-scan biometry (mean value of 5 consecutive measurements) and Pentacam were performed preoperative and three months after surgery. Preoperative status of the macula was documented by OCT (Spectralis OCT, Heidelberg Engineering, Germany). Postoperative macula-OCT examination was performed for every subject to validate the status of attached central retina. Axial length (AL), anterior chamber depth (ACD) and lens thickness (LD) were evaluated. Furthermore, prediction and absolute error (PE, AE) were calculated.


In 36 eyes the macula was preoperatively attached (Group A), whereas in 47 eyes detached (Group B). Mean axial length in group A was 24.68mm measured with A-scan biometry and 24.66mm measured by swept source OCT-assisted biometry (p=0.325). In Group B AL was 24.28mm measured with A-scan biometry and 24.26mm measured by swept source OCT-assisted biometry (p=0.625). ACD and LD differed statistically significant in both groups A (p=0.012 and p=0.018, respectively) and group B (p=0.003 and p=0.05, respectively). Prediction Error calculated with biometric formula Haigis did not differ statistically significant between both groups (p=0.094 for PE, p=0.862 for AE).


The fast swept-source OCT-assisted biometry seems to provide similar measurements to the elaborate a-scan biometry regarding the axial length in eyes with RRD and macular involvement. ACD and LD measurements are less precise with a-scan biometry. PE and AE did not differ statistically significant between groups regarding preoperative macular status.

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