July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Displacement between anterior chamber width obtained by anterior segment optical coherence tomography and white-to-white distance
Author Affiliations & Notes
  • Sunee Chansangpetch
    Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
    Ophthalmology, University of California, San Francisco, San Francisco, California, United States
  • Anwell Nguyen
    Ophthalmology, University of California, San Francisco, San Francisco, California, United States
  • Shan C Lin
    Ophthalmology, University of California, San Francisco, San Francisco, California, United States
  • Footnotes
    Commercial Relationships   Sunee Chansangpetch, None; Anwell Nguyen, None; Shan Lin, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 1118. doi:
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    • Get Citation

      Sunee Chansangpetch, Anwell Nguyen, Shan C Lin; Displacement between anterior chamber width obtained by anterior segment optical coherence tomography and white-to-white distance. Invest. Ophthalmol. Vis. Sci. 2018;59(9):1118.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : White-to-white distance (WTW) is typically used for sizing an anterior chamber intraocular lens in which the footplates are aimed to rest against the scleral spurs or the angle recesses. The CASIA2 anterior segment optical coherence tomography (AS-OCT) provides direct visualization of the scleral spurs and angle recesses. This device may provide a more accurate method for AC-IOL sizing. The objective of this study is to evaluate the correlation between WTW and the degree of its displacement from scleral spur-to-scleral spur width (STS) and recess-to-recess width (RTR).

Methods : 172 phakic eyes from 172 individuals who had mild cataracts and no history of ocular surgery or laser procedures were enrolled. WTW was measured using LenStar (LenStar LS-900, Haag-Streit AG, Koniz, Switzerland). The STS (distance between scleral spurs at horizontal meridian) and RTR (distance between angle recesses at horizontal median) was assessed in images from CASIA2 (Tomey Corporation, Nagoya, Japan). The displacement length (DL) between WTW and STS as well as WTW and RTR were defined as WTW minus STS and WTW minus RTR, respectively (Figure1). Pearson correlation coefficient and multiple linear regression were performed.

Results : Means (SD) of WTW, STS, and RTR were 11.80 (0.43), 11.70 (0.43), 11.71 (0.44), respectively. WTW showed significant positive correlation with STS (r=0.811, p<0.001) and RTR (r=0.814, p<0.001). Average DLs of WTW-STS and WTW-RTR were 0.104 and 0.094 mm, respectively. Linear regression with adjustment for age, gender, and axial length showed the DLs were greater with increased WTW (WTW-STS DL: β 0.18, p<0.001 and WTW-RTR DL: β 0.14, p=0.01).

Conclusions : Greater WTW was significantly associated with higher displacement of WTW from the two distances representing anterior chamber width. Using an AS-OCT device can be more accurate in AC-IOL sizing especially in eyes with bigger corneal diameters.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

 

Figure 1: Horizontal image from CASIA2 anterior segment optical coherence tomography illustrating displacement lengths: DL1 is the white-to-white distance minus scleral spur-to-scleral spur distance, DL2 is the white-to-white distance minus angle recess-to-angle recess distance

Figure 1: Horizontal image from CASIA2 anterior segment optical coherence tomography illustrating displacement lengths: DL1 is the white-to-white distance minus scleral spur-to-scleral spur distance, DL2 is the white-to-white distance minus angle recess-to-angle recess distance

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