Comparisons of Effective Fields of Two Ultra-Widefield Ophthalmoscopes, Optos 200Tx and Clarus 500

Figure 2

An example of comparing the number of the highest identifiable vessel branches in the upper temporal quadrant, which was performed by Rater 1. The vessel branches are sequentially numbered starting from the optic disc. In this quadrant, the 16th branch of the vessel was the highest number of branches identified in the Optos image (a) whereas the 15th branch of the vessel was the highest number of branch in the Clarus image (b). At this upper temporal quadrant, this image was classified as “O > C” by Rater 1 because the highest number of vessel branches was larger in the Optos image than in the Clarus image.

(a)

(b)