June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Comparison of Usable Image Area Acquired on Nonmydriatic Eyes Using a Widefield Slit-Scanning Ophthalmoscope and Commercial Fundus Cameras
Author Affiliations & Notes
  • Nathan D Shemonski
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Jennifer Luu
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Abouzar Eslami
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Gary C Lee
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Conor Leahy
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • T Keith Brock
    R&D, Carl Zeiss Meditec, Inc., Dublin, California, United States
  • Footnotes
    Commercial Relationships   Nathan Shemonski, Carl Zeiss Meditec, Inc. (E); Jennifer Luu, Carl Zeiss Meditec, Inc. (E); Abouzar Eslami, Carl Zeiss Meditec, Inc. (E); Gary Lee, Carl Zeiss Meditec, Inc. (E); Conor Leahy, Carl Zeiss Meditec, Inc. (E); T Brock, Carl Zeiss Meditec, Inc. (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 5456. doi:
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    • Get Citation

      Nathan D Shemonski, Jennifer Luu, Abouzar Eslami, Gary C Lee, Conor Leahy, T Keith Brock; Comparison of Usable Image Area Acquired on Nonmydriatic Eyes Using a Widefield Slit-Scanning Ophthalmoscope and Commercial Fundus Cameras. Invest. Ophthalmol. Vis. Sci. 2017;58(8):5456.

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

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Abstract

Purpose : To compare the usable image area acquired on nonmydriatic eyes of subjects with and without ocular disease using a prototype widefield (WF) slit-scanning ophthalmoscope (SSO) (ZEISS, Dublin, CA) and two standard commercial nonmydriatic fundus cameras, VISUCAM® 524 (ZEISS, Jena, Germany) and VISUCAM®PRO NM (ZEISS, Jena, Germany).

Methods : Eighteen (18) nonmydriatic eyes of 9 subjects over 50 years of age were imaged using a ZEISS prototype WF SSO with the macula centered. The system acquires images that subtend a 90° FOV as measured from the cornea. Comparison images were acquired using standard commercial nonmydriatic fundus cameras, VISUCAM 524 and VISUCAMPRO NM. Both VISUCAM 524 and VISUCAMPRO NM acquire images that subtend a 45° FOV. Eight (8) subjects had type 2 diabetes mellitus, 2 eyes had cataracts, and 2 eyes were pseudophakic. The usable image area was evaluated by an expert grader. Regions determined to be poor/unusable in image quality were marked and the remaining portion of the image was defined as usable. For the WF SSO system, the known image distortion was used to convert from area in pixels to area in mm2. VISUCAM 524 and VISUCAMPRO NM were assumed to be distortion free when converting from pixels to area in mm2.

Results : The usable image area for each device is summarized in Table 1 and Figure 1. For all 18 eyes, the average usable area for WF SSO was 327 mm2, for VISUCAM 524 was 68.5 mm2, and for VISUCAMPRO NM was 60.6 mm2.

Conclusions : The ZEISS WF SSO provides a larger usable image area than both VISUCAM 524 and VISUCAMPRO NM for nonmydriatic eyes.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

 

Table 1 - Summary of usable image area for WF SSO, VISUCAM 524, and VISUCAMPRO NM.

Table 1 - Summary of usable image area for WF SSO, VISUCAM 524, and VISUCAMPRO NM.

 

Figure 1 - Comparison of usable image area in 18 eyes (9 subjects) for WF SSO, VISUCAM 524, and VISUCAMPRO NM.

Figure 1 - Comparison of usable image area in 18 eyes (9 subjects) for WF SSO, VISUCAM 524, and VISUCAMPRO NM.

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