September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Effectiveness of tracking function of imo®, a head-mount type perimeter
Author Affiliations & Notes
  • Takuya Numata
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Chota Matsumoto
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Sayaka Yamao
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Hiroki Nomoto
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Fumi Tanabe
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Shigeki Hashimoto
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Sachiko Okuyama
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Yoshikazu Shimomura
    Kinki Univ Faculty of Medicine, Osaka-Sayama City, Osaka, Japan
  • Makoto Aihara
    The University of Tokyo, Bunkyou-ku, Japan
  • Shinji Kimura
    CREWT Medical Systems, Tokyo, Japan
  • Kenzou Yamanaka
    CREWT Medical Systems, Tokyo, Japan
  • Footnotes
    Commercial Relationships   Takuya Numata, None; Chota Matsumoto, None; Sayaka Yamao, None; Hiroki Nomoto, None; Fumi Tanabe, None; Shigeki Hashimoto, None; Sachiko Okuyama, None; Yoshikazu Shimomura, None; Makoto Aihara, The University of Tokyo (C); Shinji Kimura, CREWT Medical Systems (E); Kenzou Yamanaka, CREWT Medical Systems (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 3939. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Takuya Numata, Chota Matsumoto, Sayaka Yamao, Hiroki Nomoto, Fumi Tanabe, Shigeki Hashimoto, Sachiko Okuyama, Yoshikazu Shimomura, Makoto Aihara, Shinji Kimura, Kenzou Yamanaka; Effectiveness of tracking function of imo®, a head-mount type perimeter. Invest. Ophthalmol. Vis. Sci. 2016;57(12):3939.

      Download citation file:


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

      ×
  • Supplements
Abstract

Purpose : Results of perimetry is often influenced by the fixation point movement because of insufficient fixation of subjects. imo® is a head-mount type perimeter that has a pupil-monitoring system using an infrared camera that can track the fixation movement and adjust the target presentation location real-time. We examined the effectiveness of the tracking function of imo® by determining the blind spot under the fixation point movement

Methods : Eleven eyes of eleven normal volunteers (average age, 33.6 ± 5.5 yr) with no eye diseases were used for assessing the blind spot in the area of 13° × 11° (1° grid), using target size III, background luminance 31.4 asb, target luminance 15 dB, and single light strategy. Two conditions were used for the assessment: usual fixation and fixation point movement. Under the fixation point movement, the fixation point was moved every 15 sec in 4 directions by 5°, and the blind spot was assessed with tracking function on or off. First, under the usual fixation, the blind spot was determined and this blind spot was defined as the reference area. Next, we counted the number of non-response test points in it. This number was used as the control. Then under the fixation point movement with tracking function on or off, we counted the number of non-response test points in the reference area. And we investigated effectiveness of the tracking function by calculating the concordance ratio between the number of non-response test points under fixation point movement and the control.

Results : The concordance ratio was 37.5 ± 10.4% with the tracking function off, and 72.2 ± 11.6% with tracking on. There was a significant difference of the concordance ratio between the two groups (Wilcoxon signed-rank test, p 〈 1%).The ratio significantly increased when the tracking function was on.

Conclusions : Tracking function is effective in cancelling the influence of the fixation point movement on the detection of the blind spot. We suggest the tracking function of imo® is effective in the assessment of the blind spot when the subject’s fixation is insufficient.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×