Abstract
Purpose :
To determine how long it takes for the Topcon NW500 fundus camera to automatically acquire four images and to assess their quality using the bilateral 2-field fundus imaging protocol.
Methods :
Upon positioning a subject’s head on the chinrest and forehead rest, the operator initiated the bilateral 2-field acquisition protocol. The NW500 automatically captured images centered on the optic disc and macula, respectively. The same image acquisition protocol was repeated for both eyes. A total of 4 images were acquired per subject (Figure 1). Total acquisition time was recorded as the time the capture button was pressed until the final image was displayed on the screen. All images were captured in a well-illuminated room without dilation. An experienced imgae grader determined the clinical usefullness using a 5-point grading scale (with 1 as the lowest and 5 as the highest).
Results :
Ten eyes of five subjects were imaged. The demographics of the subjects were as follows: mean age was 61.8 years; majority female (60%); majority Caucasian (80% Caucasian, 20% African American & American Indian/Alaskan Native). Subjects were not screened for the presence or absence of ocular pathology. However, subjects self-reported known eye conditions (ocular hypertension, glaucoma suspect, glaucoma x3). The mean total acquisition time was 56 seconds with a range of 49 to 67 seconds. The average image quality score was 4.7.
Conclusions :
On average, the bilateral 2-field fundus imaging protocol automatically captures four high quality images in less than one minute in a well-illuminated room without dilation. Using this protocol, the NW500 is an ideal fit for screening environments that may have less experienced users, undilated patients and brighter imaging conditions.
This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.