Related Experiment Video
Updated: Feb 4, 2026
Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
Published on: August 4, 2018
Accuracy of SS-OCT biometry compared with partial coherence interferometry biometry for combined phacovitrectomy with
Efstathios Vounotrypidis1, Velina Haralanova1, Daniel R Muth1
1Department of Ophthalmology, Ludwig-Maximilians-University, Munich, Germany.
Purpose:
To evaluate the accuracy of a swept-source optical coherence tomography (SS-OCT) biometer compared with a standard partial coherence interferometry (PCI) biometer in terms of phacovitrectomy for vitreomacular pathology and cataract.
Setting:
Department of Ophthalmology, Ludwig-Maximilians-University Munich, Germany.
Design:
Prospective, nonrandomized, single center consecutive case series.
Methods:
Patients with age-related cataract, regular corneal astigmatism less than 1.25 diopters (D) and a clinically significant vitreomacular pathology (epiretinal membrane [ERM], macular hole, or vitreomacular traction [VMT] syndrome) who had combined phacovitrectomy with internal limiting membrane peeling were enrolled. Objective and manifest refraction, corrected distance visual acuity, SS-OCT biometry, and PCI biometry were obtained preoperatively and 3 months postoperatively. The refractive prediction error and mean absolute error (MAE) were calculated for each biometric device with the Haigis formula. The percentage of eyes with a prediction error within ±0.50 D or less were calculated.
Results:
The study comprised 79 eyes of 79 patients. The mean refractive prediction error of all eyes was -0.27 D ± 0.76 (SD) for the PCI biometer and -0.28 ± 0.57 D for the SS-OCT biometer (P = .802), and the MAE was 0.61 ± 0.53 D and 0.46 ± 0.43 D, respectively (P = .012). A prediction error within ±0.50 D or less was observed in 55 eyes (70%) with the SS-OCT biometer compared with 42 eyes (53%) with the PCI biometer (P = .0001). The MAE with the SS-OCT biometer was statistically significantly lower in eyes with ERMs or macular holes compared with the PCI biometer (P = .043 and P = .028, respectively), whereas no statistically significant difference was observed in eyes with VMT syndrome (P = .286).
Conclusions:
The SS-OCT biometer showed a statistically significant lower MAE compared with the PCI biometer, and it is recommended for precise intraocular lens power calculations in combined phacovitrectomy for cataract and vitreomacular diseases.
Related Concept Videos
01:28Accuracy, limits, and approximation
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
03:37Uncertainty in Measurement: Accuracy and Precision
02:07Improving Translational Accuracy
01:31Internal Receptors
02:27Limiting Reactant
02:00Internal Energy