Change in optical axial length after cataract surgery: segmental method vs composite method
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Published on: April 3, 2016
So Goto1, Naoyuki Maeda, Toru Noda
1From the Department of Ophthalmology, Osaka University Graduate School of Medicine (Goto, Maeda, Koh, Nishida), Osaka, Department of Ophthalmology, National Hospital Organization, Tokyo Medical Center (Noda, Iehisa), Tokyo, Japan; School of Optometry, University of California Berkeley (Goto), Berkeley, California, USA; Laboratorio de Lente Verde (Ohnuma), Chiba, Integrated Frontier Research for Medical Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University (Nishida), Osaka, Japan.
Purpose:
To compare the changes in axial length (AL) obtained after cataract surgery by partial coherence interferometry (PCI), swept-source optical coherence tomography with the composite method (SS-OCT/CM), and SS-OCT with the segmental method (SS-OCT/SM).
Setting:
National Hospital Organization, Tokyo Medical Center, Japan.
Design:
Retrospective case series.
Methods:
AL was measured preoperatively and 1 month postoperatively by PCI, SS-OCT/CM, and SS-OCT/SM.
Results:
Two hundred sixty-eight eyes in 139 patients who underwent cataract surgery were included. The mean ALs measured by PCI and SS-OCT/CM decreased significantly from 24.14 ± 1.58 to 24.05 ± 1.58 mm (P < .0001) and from 24.15 ± 1.58 to 24.05 ± 1.59 mm (P < .0001), respectively. The mean differences between the preoperative and postoperative AL were 0.083 ± 0.044 mm (PCI) and 0.096 ± 0.045 mm (SS-OCT/CM), respectively; Bland-Altman analysis revealed fixed bias between the preoperative and postoperative values. The mean preoperative and postoperative ALs measured by SS-OCT/SM were 24.12 ± 1.54 and 24.12 ± 1.54 mm, respectively (P = 0.97). The mean difference between the preoperative and postoperative ALs was 0.00 ± 0.03 mm on SS-OCT/SM; Bland-Altman analysis indicated good agreement between these values.
Conclusions:
The difference between preoperative and postoperative ALs is less with SS-OCT/SM than with PCI or SS-OCT/CM. Assuming that AL is not altered by cataract surgery, AL measurement is more accurate by SS-OCT/SM than by PCI or SS-OCT/CM.
