Fig 1.
Measurement of the anterior chamber depth (ACD) and intraocular lens (IOL) decentration and tilt on the ultrasound biomicroscopy image of the anterior segment.
ACD was determined from the central inner corneal surface, perpendicular to the corneal surface to the most anteriorly visible part of the IOL. A line (line AB) was drawn between the two scleral spurs (SSs), as the base line of reference for IOL position. Two perpendicular lines were drawn from both optical endpoints of the IOL (C and D) to the base line with intersection points (E and F). IOL decentration was equal to half of the differences between distance AE and FB, i.e. IOL decentration = (|AE—FB|) / 2. IOL tilt was determined by the angle (θ) formed by the line between the two optical endpoints and the base line. A line parallel to line AB was drawn intersecting one of the optical endpoints (D). Angle θ was calculated with following formula:
Fig 2.
Measurement of the angle on the ultrasound biomicroscopy image of the anterior segment.
Angle-opening distance at 500 μm (AOD500) was measured on a line perpendicular to the trabecular meshwork at points 500 μm from the scleral spur. Trabecular-iris angle (TIA) was measured with the apex in the iris recess and the arms of the angle passing through a point on the trabecular meshwork 500 μm from the scleral spur and the point on the iris perpendicularly opposite.
Table 1.
Demographics and clinical characteristics of children underwent pediatric cataract surgery and posterior chamber intraocular lenses implantation.
Fig 3.
Comparison of intraocular lens (IOL) decentration (A) and IOL tilt (B) between the ciliary sulcus fixation and capsular bag fixation groups in horizontal and vertical directions. (* indicates significant difference groups, p < 0.05)
Table 2.
Outcomes of ultrasound biomicroscopy of the anterior segment in children underwent ciliary sulcus versus capsular bag fixation of posterior chamber intraocular lenses.
Table 3.
Long-term visual outcomes and postoperative complications of ciliary sulcus versus capsular bag fixation of posterior chamber intraocular lenses in children.