Godefroy Kaswin1, Antoine Rousseau1, Mohamed Mgarrech1, Emmanuel Barreau1, Marc Labetoulle2. 1. From the Service d'Ophtalmologie (Kaswin, Rousseau, Mgarrech, Barreau, Labetoulle), Hôpital Bicêtre, APHP, Université Paris Sud, Le Kremlin-Bicêtre and Laboratoire de Virologie Moléculaire et Structurale CNRS UPR 3296 (Rousseau, Labetoulle), Gif sur Yvette, France. 2. From the Service d'Ophtalmologie (Kaswin, Rousseau, Mgarrech, Barreau, Labetoulle), Hôpital Bicêtre, APHP, Université Paris Sud, Le Kremlin-Bicêtre and Laboratoire de Virologie Moléculaire et Structurale CNRS UPR 3296 (Rousseau, Labetoulle), Gif sur Yvette, France. Electronic address: marc.labetoulle@bct.aphp.fr.
Abstract
PURPOSE: To evaluate the agreement in axial length (AL), keratometry (K), anterior chamber depth (ACD) measurements; intraocular lens (IOL) power calculations; and predictability using a new partial coherence interferometry (PCI) optical biometer (AL-Scan) and a reference (gold standard) PCI optical biometer (IOLMaster 500). SETTING: Service d'Ophtalmologie, Hopital Bicêtre, APHP Université, Paris, France. DESIGN: Evaluation of a diagnostic device. METHODS: One eye of consecutive patients scheduled for cataract surgery was measured. Biometry was performed with the new biometer and the reference biometer. Comparisons were performed for AL, average K at 2.4 mm, ACD, IOL power calculations with the Haigis and SRK/T formulas, and postoperative predictability of the devices. A P value less than 0.05 was statistically significant. RESULTS: The study enrolled 50 patients (mean age 72.6 years±4.2 SEM). There was a good correlation between biometers for AL, K, and ACD measurements (r=0.999, r=0.933, and r=0.701, respectively) and between IOL power calculation with the Haigis formula (r=0.972) and the SRK/T formula (r=0.981). The mean absolute error (MAE) in IOL power prediction was 0.42±0.08 diopter (D) with the new biometer and 0.44±0.08 D with the reference biometer. The MAE was 0.20 D with the Haigis formula and 0.19 with the SRK/T formula (P=.36). CONCLUSION: The new PCI biometer provided valid measurements compared with the current gold standard, indicating that the new device can be used for IOL power calculations for routine cataract surgery. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
PURPOSE: To evaluate the agreement in axial length (AL), keratometry (K), anterior chamber depth (ACD) measurements; intraocular lens (IOL) power calculations; and predictability using a new partial coherence interferometry (PCI) optical biometer (AL-Scan) and a reference (gold standard) PCI optical biometer (IOLMaster 500). SETTING: Service d'Ophtalmologie, Hopital Bicêtre, APHP Université, Paris, France. DESIGN: Evaluation of a diagnostic device. METHODS: One eye of consecutive patients scheduled for cataract surgery was measured. Biometry was performed with the new biometer and the reference biometer. Comparisons were performed for AL, average K at 2.4 mm, ACD, IOL power calculations with the Haigis and SRK/T formulas, and postoperative predictability of the devices. A P value less than 0.05 was statistically significant. RESULTS: The study enrolled 50 patients (mean age 72.6 years±4.2 SEM). There was a good correlation between biometers for AL, K, and ACD measurements (r=0.999, r=0.933, and r=0.701, respectively) and between IOL power calculation with the Haigis formula (r=0.972) and the SRK/T formula (r=0.981). The mean absolute error (MAE) in IOL power prediction was 0.42±0.08 diopter (D) with the new biometer and 0.44±0.08 D with the reference biometer. The MAE was 0.20 D with the Haigis formula and 0.19 with the SRK/T formula (P=.36). CONCLUSION: The new PCI biometer provided valid measurements compared with the current gold standard, indicating that the new device can be used for IOL power calculations for routine cataract surgery. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
Authors: Tommy C Y Chan; Marco C Y Yu; Vivian Chiu; Gilda Lai; Christopher K S Leung; Poemen P M Chan Journal: Sci Rep Date: 2021-07-21 Impact factor: 4.379