July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Wide-angle B-mode evaluation of the shape of eyeballs in rhegmatogenous retinal detachment
Author Affiliations & Notes
  • Yoshiaki Shimada
    fujita health university, Japan
  • Ryota Sakurai
    fujita health university, Japan
  • Tadashi Mizuguchi
    fujita health university, Japan
  • Ryoko Nomura
    fujita health university, Japan
  • Atsuhiro Tanikawa
    fujita health university, Japan
  • Masayuki Horiguchi
    fujita health university, Japan
  • Footnotes
    Commercial Relationships   Yoshiaki Shimada, None; Ryota Sakurai, None; Tadashi Mizuguchi, None; Ryoko Nomura, None; Atsuhiro Tanikawa, None; Masayuki Horiguchi, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 6572. doi:
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      Yoshiaki Shimada, Ryota Sakurai, Tadashi Mizuguchi, Ryoko Nomura, Atsuhiro Tanikawa, Masayuki Horiguchi; Wide-angle B-mode evaluation of the shape of eyeballs in rhegmatogenous retinal detachment. Invest. Ophthalmol. Vis. Sci. 2019;60(9):6572.

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

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Abstract

Purpose : To investigate the characteristics of the shape of eyeballs that developed rhegmatogenous retinal detachment (RRD).

Methods : The axial length (AL) and horizontal and vertical diameter (HD and VD, respectively) of eyeballs were measured using a newly developed wide-angle B-mode ultrasonography. The probe has an arc scan oscillator that can captures a 100 degree angle of field, whereas a conventional sector scan oscillator captures only approximately 52 degree. It can also measure eyeball diameter from the obtained images.
Sixty-five eyes of 65 subjects with RRD (RRD group) prior to surgery and 32 eyes of 32 subjects without RRD (NS group) were assessed. All subjects were 25-years old or older with AL 23–26 mm.

Results : AL (RRD group: 24.7 ± 0.8 mm /NS group: 24.1 ± 0.9 mm) and HD (RRD: 21.1 ± 1.7 /NS: 20.5 ± 1.1) were significantly longer in the RRD group tan in the NS group (P < 0.01 and < 0.05, respectively). However, VD (RRD: 20.9 ± 1.8 /NS: 21.1 ± 1.7) did not differ significantly between the groups (P = 0.75). The ratio of HD to VD (HD/VD) was 1.010 ± 0.046 in the RRD group, which was statistically higher than that of 0.973 ± 0.040 in the NS group (P < 0.001).

Conclusions : Surveillances using magnetic resonance imaging (MRI) have reported that myopic eyeballs are vertically longer on average (Atchison 2004, IOVS). Moreover, emmetropic eyes are also vertically long among the Japanese population (Watanabe 2011). Our results are consistent with previous reports of vertically long eyeballs, and to the best of our knowledge; our study is the first to report that RRD eyes are horizontally long on average by way of contrast.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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