Abstract
BackgroundThe present study aimed to assess changes in, and the factors that influence, anterior chamber volume (ACV) after implantable contact lens (ICL) implantation in high myopia eyes using a Pentacam.MethodsThe study sampled 26 high myopia patients (45 eyes) who were treated with ICL implantation. These patients were followed for an average of 4.28 months postoperatively. ACV was measured with a Pentacam preoperatively and at 3 months postoperatively. The data were analyzed by paired samples Wilcoxon signed-rank test. Generalized estimating equation (GEE) model adjusting within-patient intereye correlations in addition to Pearson’s and Spearman’s correlation tests were performed to determine associations.ResultsThe mean ACV was 198.33 ± 33.08 mm3 before surgery and 118.65 ± 17.70 mm3 after surgery. A significant decrease of 79.68 mm3 (40.18%) (Z = 5.841, P < 0.001) was detected. Positive correlations were found between ACV changes and ICL central vault (r = 0.528, P < 0.001) and preoperative anterior chamber depth (ACD) (r = 0.665, P < 0.001). There were positive correlations between postoperative ACV and postoperative anterior chamber angle (ACA) at 3:00 o’clock (r = 0.448, P = 0.002) and at 9:00 o’clock (r = 0.405, P = 0.006). GEE regression model showed that postoperative ACV significantly positively correlated with preoperative ACV (P = 0.002), ACD (P = 0.002) and horizontal ACA (P = 0.005) and negatively correlated with ICL central vault (P < 0.001).ConclusionComplementary to vault and ACD, ACV is a sensitive parameter with certain value of preoperative assessment and postoperative monitoring in ICL implantation.
Highlights
The present study aimed to assess changes in, and the factors that influence, anterior chamber volume (ACV) after implantable contact lens (ICL) implantation in high myopia eyes using a Pentacam
ACV and anterior chamber depth (ACD) measurements obtained from the Pentacam are more useful in screening for angle closure, because they are less dependent on the configuration of the peripheral part of the anterior chamber angle (ACA) [1]
ACV significantly decreased by 79.68 mm3 (40.18%); ACD decreased by 0.92 mm (28.40%); ACA at 3 and 9 o’clock respectively decreased by 15.80°(34.70%) and 15.58°(36.75%)
Summary
The present study aimed to assess changes in, and the factors that influence, anterior chamber volume (ACV) after implantable contact lens (ICL) implantation in high myopia eyes using a Pentacam. The implantable collamer lens (ICL V4; STAAR Surgical, Nidau, Switzerland) is a sulcus-placed posterior chamber phakic intraocular lens that can correct high myopia. Laser peripheral iridectomy (LPI) is routinely performed before ICL V4 implantation to prevent intraocular. As a widely applied non-contact procedure used in the clinic, the Pentacam system (Oculus Inc., Wetzlar, Germany) allows measurement of the ACA, anterior chamber volume (ACV), axial anterior chamber depth (ACD) and ICL vault. ACV and ACD measurements obtained from the Pentacam are more useful in screening for angle closure, because they are less dependent on the configuration of the peripheral part of the ACA [1]. The ACV has been described as a sensitive parameter for monitoring ACA width and LPI efficacy [2, 3]
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