Abstract
PurposeTo evaluate intraocular lens (IOL) tilt and decentration by anterior segment optical coherence tomography (AS-OCT) using 3-dimensional (3D) reconstruction method.DesignProspective observational case series.ParticipantsThirty-nine patients (39 eyes) were included.MethodsThe IOL positions of all eyes were examined by AS-OCT. Images were obtained in 4 axes (0–180 degrees, 45–225 degrees, 90–270 degrees, and 135–315 degrees) using the quadrant-scan model. The cross-sectional images were analyzed with MATLAB software.Main Outcome MeasuresThe angle (θ) between the reference pupillary plane and the IOL plane, the distances between the center points of the pupil circle and the IOL on the x-axis (dx) and y-axis (dy) and the spatial distance (ds) were calculated after 3D-reconstruction.ResultsThe mean angle (θ) between the pupillary plane and the IOL plane was 2.94±0.99 degrees. The mean IOL decentration of dx and dy was 0.32±0.26 mm and 0.40±0.27 mm, respectively. The ds of the IOL decentration was 0.56±0.31 mm. There was no significant correlation between the ocular residual astigmatism (ORA) and the tilted angle or the decentration distance. There was a significant correlation between the ORA and total astigmatism (r = 0.742, P<0.001). There was no significant correlation between the postoperative best corrected visual acuity (BCVA) and the ORA (r = 0.156; P = 0.344), total astigmatism (r = 0.012; P = 0.942), tilted angle (θ; r = 0.172; P = 0.295) or decentration distance (dx: r = 0.191, P = 0.244; dy: r = 0.253, P = 0.121; ds: r = 0.298, P = 0.065).ConclusionsAS-OCT can be used as an alternative for the analysis of IOL tilt and decentration using 3D-reconstruction.
Highlights
The accurate alignment of the intraocular lens (IOL) in the capsular bag is important for aspects of optical performance such as astigmatism, best-corrected visual acuity (BCVA) and high-order aberrations [1,2,3,4]
There was no significant correlation between the ocular residual astigmatism (ORA) and the tilted angle or the decentration distance
Anterior segment optical coherence tomography (AS-OCT) can be used as an alternative for the analysis of IOL tilt and decentration using 3D-reconstruction
Summary
The accurate alignment (tilt and decentration) of the intraocular lens (IOL) in the capsular bag is important for aspects of optical performance such as astigmatism, best-corrected visual acuity (BCVA) and high-order aberrations [1,2,3,4]. Several methods, such as Scheimpflug imaging, Purkinje reflection, ultrasound biomicroscopy, the anterior segment analysis system and photographic documentation, can be used for IOL position analysis in the clinic [5,6,7,8,9]. We analyzed the decentration of IOLs implanted within the capsular bag after uneventful phacoemulsification using AS-OCT and correlated the results with BCVA and refractive outcomes
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