Measurement of and Factors Associated with the Anterior Chamber Volume in Healthy Chinese Adults

Zong, Yuan; Xu, Qian; Jiang, Chunhui; Zhu, Haohao; Yu, Jian; Sun, Xinghuai

doi:10.1155/2017/6762047

Cited by 17 publications

(11 citation statements)

References 28 publications

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“…However, our study showed a 40.2% decrease in ACV, even after LPI, indicating that the decrease in the ACD after ICL insertion plays a more dominant role in the change in ACV than does LPI. A study conducted on healthy Chinese adults reported that the ACV was correlated with most of the anterior segment parameters, especially ACD, which accounted for approximately 85% of the variation in the ACV [ 8 ], consistent with the findings in the current study.…”

Section: Discussionsupporting

confidence: 91%

Changes in anterior chamber volume after implantation of posterior chamber phakic intraocular lens in high myopia

2018

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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.

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Section: Discussionsupporting

confidence: 91%

Changes in anterior chamber volume after implantation of posterior chamber phakic intraocular lens in high myopia

2018

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“…Image tracking with averaging is a unique aspect of this swept-source AS-OCT as well. For sweptsource OCT, other anterior segment OCTs have been developed [ 11 – 17 ], but they lacked image tracking and averaging and could not visualize the entire lens thickness (from anterior to posterior pole). The importance of averaging is the main reason why posterior segment OCT is so widely used and clinically applicable [ 6 – 8 ].…”

Section: Discussionmentioning

confidence: 99%

“…Swept-source OCT (SS-OCT), using a ~1300 nm laser, improved on this with better speed and depth of penetration [ 4 ]. Multiple publications have described SS-OCT for imaging the cornea, anterior chamber, anterior chamber angle, and iris [ 11 – 17 ], although tracking capabilities and full lens thickness imaging could not be performed. Thus, SS-OCT has some inherent advantages for AS-OCT due to its speed and image coverage for large areas at a wavelength which provides more detailed information about ocular anatomy.…”

Section: Introductionmentioning

confidence: 99%

Age- and refraction-related changes in anterior segment anatomical structures measured by swept-source anterior segment OCT

Xie¹,

Corradetti²,

Song³

et al. 2020

PLoS ONE

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Purpose To assess the effects of age and refractive status on anterior segment anatomical structures, including the ciliary body, using a new swept-source anterior segment optical coherence tomography (AS-OCT) device. Methods This prospective observational study included 63 healthy volunteers (mean age: 44.2 years). Images of the anterior segment were obtained using a new swept-source AS-OCT (ANTERION, Heidelberg Engineering GmbH, Heidelberg, Germany) with tracking and image averaging from the right eye of all participants. Repeatability as well as inter- and intra-observer reliability of biometric measurements were evaluated. The impact of image tracking and averaging on ciliary muscle measurements was tested. Univariate and multivariable statistical models were developed to evaluate the relationship of age and refractive status on anterior segment biometric measurements. Results For all test-retest repeatability and inter- and intra-observer reproducibility of swept-source AS-OCT measurements, high intraclass correlation (ICC) was noted (0.88–1.00). The nasal maximum ciliary muscle thickness (CMTMAX) and distance between scleral spur to the thickest point of the ciliary muscle (SSMAX) were larger than those on the temporal side ( p <0.001 and p = 0.006, respectively). Nasal and temporal CMTMAX ( p = 0.004 and p <0.001, respectively) and lens thickness ( p <0.01) increased with age. Nasal and temporal SSMAX decreased with older age and increasing hyperopia ( p = 0.01 and p <0.001, respectively). Image averaging resulted in improved ciliary muscle measurements ( p = 0.008 to 0.02). Lens vault increased with older age and increased hyperopia ( p <0.01). OCT measurements of the angle decreased with older age and increased hyperopia ( p< 0.001 to 0.03). Aqueous depth decreased with older age and increased hyperopia ( p <0.01). Pupil diameter decreased with older age ( p <0.01). Conclusions Repeatability and reproducibility of biometric measurements using the ANTERION AS-OCT were excellent. Image averaging improved the accuracy of ciliary muscle measurements. The device produced measurements of biometric parameters that described superficial and deep structures including the ciliary body and full lens thickness from a single image.

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“…A carefully monitoring of anterior chamber angle and IOP is required in the early postoperative period. However, despite that the longer period results suggested a great stability of anterior chamber angle, regular visits are essential as the anterior chamber space decreases with age, especially after 40 years of age [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

Two-Year Outcomes of Visian Implantable Collamer Lens with a Central Hole for Correcting High Myopia

Yan

Miao

Zhao

et al. 2018

Journal of Ophthalmology

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Purpose To investigate two-year outcomes of Visian Implantable Collamer Lens with a central hole (ICL V4c) implantation for correcting high myopia. Methods Sixty-one eyes of 32 patients went through ICL V4c implantation. Safety, efficacy, predictability, and intraocular pressure were evaluated 2 years postoperatively. Anterior chamber volume (ACV), anterior chamber depth (ACD), anterior chamber angle width (ACAW), and vault were measured using a Scheimpflug tomography imaging system. Results At 2 years, the spherical equivalent refraction decreased from preoperative −14.62 ± 4.29 D to −0.90 ± 0.95 D, with 79% of the eyes within ±0.50 D and 98% within ±1.00 D of the intended correction. The efficacy index was 1.03 ± 0.23, and the safety index was 1.24 ± 0.26. Corrected distance visual acuity (CDVA) remained unchanged in 23% of the eyes, 75% gained one or more lines of CDVA, and 2% lost one line. The ACV, ACD, and ACAW, respectively, decreased from 193.28 ± 29.15 mm3, 3.15 ± 0.23 mm, and 36.51 ± 6.54 degree to 112.48 ± 17.01 mm3, 2.99 ± 0.23 mm, and 22.54 ± 5.27 degree (p=0.0008, 0.008, and 0.0003, resp.). Intraocular pressure was 15.39 ± 2.88 mmHg before surgery and was 15.86 ± 4.11 mmHg at 2 years (p=0.11). Conclusion Implantation of ICL V4c is a safe, effective, and predictable procedure for correcting high myopia. Reduction of anterior chamber space after surgery did not induce intraocular pressure increase during the 2-year follow-up.

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Measurement of and Factors Associated with the Anterior Chamber Volume in Healthy Chinese Adults

Cited by 17 publications

References 28 publications

Changes in anterior chamber volume after implantation of posterior chamber phakic intraocular lens in high myopia

Changes in anterior chamber volume after implantation of posterior chamber phakic intraocular lens in high myopia

Age- and refraction-related changes in anterior segment anatomical structures measured by swept-source anterior segment OCT

Two-Year Outcomes of Visian Implantable Collamer Lens with a Central Hole for Correcting High Myopia

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