Effect of Lateral Decubitus Body Posture on Anterior Chamber Angle in Healthy Subjects: An Anterior Segment Optical Coherence Tomography Study

Ji Hye Park, Dong Yun Yeon, Chungkwon Yoo, Yong Yeon Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Purpose: To investigate the effect of the lateral decubitus (LD) position on the anterior chamber (AC) angle in healthy subjects. Materials and Methods: Twenty-three healthy young subjects were included in this prospective observational study. We measured AC angle parameters in the sitting and the left LD positions using anterior segment optical coherence tomography (Visante OCT): trabecular-iris angle (TIA), angle opening distance (AOD 500), trabecular-iris space area (TISA 500), anterior chamber width, lens vault, and anterior chamber depth. The Wilcoxon signed-rank test was used to compare the parameters between different body positions. Interobserver reproducibility of AC angle measurements was assessed by intraclass correlation coefficients. Results: Postural alterations from sitting to the left LD position significantly reduced the AC angle on the temporal side in right eyes (TIA: 39.53±2.38 to 38.31±3.47 degrees; AOD 500: 0.72±0.13 to 0.65±0.08; TISA 500: 0.25±0.06 to 0.22±0.04; all P<0.05), whereas no significant changes were noted on the nasal side. Contrastingly, a significant decrease in the AC angle on the nasal side was noted for left eyes (TIA: 39.49±2.24 to 38.17±2.76 degrees; AOD 500: 0.68±0.09 to 0.64±0.10; TISA 500: 0.23±0.04 to 0.21±0.03; all P<0.05). Anterior chamber width and anterior chamber depth were unaffected by postural alterations, but lens vault significantly was reduced following a shift to the left LD position. Conclusions: The AC angle parameters on the nondependent side of the eye in the LD position were significantly reduced compared with those in the sitting position. Therefore, postural shift from sitting to the LD position may induce alterations in the AC angle.

Original languageEnglish
Pages (from-to)608-612
Number of pages5
JournalJournal of Glaucoma
Volume26
Issue number7
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Optical Coherence Tomography
Anterior Chamber
Posture
Healthy Volunteers
Iris
Nose
Lenses
Nonparametric Statistics
Observational Studies
Prospective Studies

Keywords

  • angle closure
  • anterior chamber angle
  • anterior segment optical coherence tomography
  • glaucoma
  • posture

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Effect of Lateral Decubitus Body Posture on Anterior Chamber Angle in Healthy Subjects : An Anterior Segment Optical Coherence Tomography Study. / Park, Ji Hye; Yeon, Dong Yun; Yoo, Chungkwon; Kim, Yong Yeon.

In: Journal of Glaucoma, Vol. 26, No. 7, 01.01.2017, p. 608-612.

Research output: Contribution to journalArticle

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abstract = "Purpose: To investigate the effect of the lateral decubitus (LD) position on the anterior chamber (AC) angle in healthy subjects. Materials and Methods: Twenty-three healthy young subjects were included in this prospective observational study. We measured AC angle parameters in the sitting and the left LD positions using anterior segment optical coherence tomography (Visante OCT): trabecular-iris angle (TIA), angle opening distance (AOD 500), trabecular-iris space area (TISA 500), anterior chamber width, lens vault, and anterior chamber depth. The Wilcoxon signed-rank test was used to compare the parameters between different body positions. Interobserver reproducibility of AC angle measurements was assessed by intraclass correlation coefficients. Results: Postural alterations from sitting to the left LD position significantly reduced the AC angle on the temporal side in right eyes (TIA: 39.53±2.38 to 38.31±3.47 degrees; AOD 500: 0.72±0.13 to 0.65±0.08; TISA 500: 0.25±0.06 to 0.22±0.04; all P<0.05), whereas no significant changes were noted on the nasal side. Contrastingly, a significant decrease in the AC angle on the nasal side was noted for left eyes (TIA: 39.49±2.24 to 38.17±2.76 degrees; AOD 500: 0.68±0.09 to 0.64±0.10; TISA 500: 0.23±0.04 to 0.21±0.03; all P<0.05). Anterior chamber width and anterior chamber depth were unaffected by postural alterations, but lens vault significantly was reduced following a shift to the left LD position. Conclusions: The AC angle parameters on the nondependent side of the eye in the LD position were significantly reduced compared with those in the sitting position. Therefore, postural shift from sitting to the LD position may induce alterations in the AC angle.",
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N2 - Purpose: To investigate the effect of the lateral decubitus (LD) position on the anterior chamber (AC) angle in healthy subjects. Materials and Methods: Twenty-three healthy young subjects were included in this prospective observational study. We measured AC angle parameters in the sitting and the left LD positions using anterior segment optical coherence tomography (Visante OCT): trabecular-iris angle (TIA), angle opening distance (AOD 500), trabecular-iris space area (TISA 500), anterior chamber width, lens vault, and anterior chamber depth. The Wilcoxon signed-rank test was used to compare the parameters between different body positions. Interobserver reproducibility of AC angle measurements was assessed by intraclass correlation coefficients. Results: Postural alterations from sitting to the left LD position significantly reduced the AC angle on the temporal side in right eyes (TIA: 39.53±2.38 to 38.31±3.47 degrees; AOD 500: 0.72±0.13 to 0.65±0.08; TISA 500: 0.25±0.06 to 0.22±0.04; all P<0.05), whereas no significant changes were noted on the nasal side. Contrastingly, a significant decrease in the AC angle on the nasal side was noted for left eyes (TIA: 39.49±2.24 to 38.17±2.76 degrees; AOD 500: 0.68±0.09 to 0.64±0.10; TISA 500: 0.23±0.04 to 0.21±0.03; all P<0.05). Anterior chamber width and anterior chamber depth were unaffected by postural alterations, but lens vault significantly was reduced following a shift to the left LD position. Conclusions: The AC angle parameters on the nondependent side of the eye in the LD position were significantly reduced compared with those in the sitting position. Therefore, postural shift from sitting to the LD position may induce alterations in the AC angle.

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KW - posture

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