June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Alteration in anterior chamber depth and volume following postural change from upright to right and left lateral decubitus positions
Author Affiliations & Notes
  • Susan Ly
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • Denisse Lopez
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • Carolyn Majcher
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • Rick Trevino
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • William Eric Sponsel
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • David Caceres
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • Roman Golas
    Optometry, The University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX
  • Lane M Smiley
    STEM RAM Academy, San Antonio, TX
  • Footnotes
    Commercial Relationships Susan Ly, None; Denisse Lopez, None; Carolyn Majcher, None; Rick Trevino, None; William Sponsel, None; David Caceres, None; Roman Golas, None; Lane Smiley, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 4982. doi:
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      Susan Ly, Denisse Lopez, Carolyn Majcher, Rick Trevino, William Eric Sponsel, David Caceres, Roman Golas, Lane M Smiley; Alteration in anterior chamber depth and volume following postural change from upright to right and left lateral decubitus positions. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):4982.

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Abstract
 
Purpose
 

We performed a prospective observational study to determine the response of anterior chamber (AC) parameters following postural change from upright to right lateral decubitus (RLD) and left lateral decubitus (LLD) position over a 1-hr period in healthy adults.

 
Methods
 

Anterior segment tomography (AST) was performed bilaterally using the Oculus Pentacam® on 15 normal adults in a seated upright position. The subject was then randomly placed in a RLD or LLD position for 1-hr. after AST was repeated while the subject remained in the lateral position. All subjects returned on a separate date to repeat the procedure on the opposite side. Analyzed parameters included anterior chamber volume (ACV), central anterior chamber depth (CACD), and peripheral anterior chamber depth (PACD) at 6mm, 8mm, and 10mm eccentricity in 4 principle meridians (superior, inferior, nasal, temporal). Statistical analysis was performed using paired, 2-tailed t-test and assuming 90° rotation.

 
Results
 

Average age (±SD) was 34±12.5 years (range 23-58). 13 subjects were female and 2 were male. In order of decreasing depth, the upright mean PACDs at 6mm eccentricity were 2334±323µm temp., 2143±353µm inf., 1833±344µm sup., and 1765±302um nasally (Fig. 1). There was no difference in AC parameter change in dependent and non-dependent eyes between the RLD and LLD positions. There was a significant decrease in the ACV and CACD in dependent eyes (mean -5.73mm3 p < 0.001, -17µm p=.05) and non-dependent eyes (-3.87mm3 p=.01, -14 µm p<.05). In dependent eyes, there was a significant decrease in the inf. PACD at 6mm (-96µm p<.001) and 8mm (-233µm p<.001) eccentricities and the temp. PACD at 6mm (-95µm p=.01), 8mm (-182µm p<.001), and 10mm (-88µm p=.01) eccentricities. Interesting there was an increase in the sup. PACD at 6mm (+105µm p=.01) and 8mm (+125µm p<.01) eccentricities. In the non-dependent eyes, there was a significant decrease in the temp. PACD at all eccentricities (6mm: -186µm p< 0.001, 8mm: -275µm p< 0.001, 10mm: -176µm p<.001).

 
Conclusions
 

There is a significant decrease in ACV and CACD bilaterally after assuming a lateral decubitus position for 1 hr. These changes are similar between RLD and LLD positions. The decrease in PACD appears to be localized to the inferior/temporal quadrants. Further research is needed to determine if this AC shallowing contributes to IOP elevation.  

 

 
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