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

Figure 3

Fundus images obtained by the Optos and Clarus devices of a 42-year-old man with Coats’ disease that was evaluated by Rater 2. White arrows indicate the positions of the most peripheral branch identified on both devices. The asterisks indicate the branching positions more peripheral to the arrow in one device. In addition, the numbers indicate the branches identified beyond the most peripheral branch by the other device. In this case, three additional branches were identified in the upper temporal quadrant and an additional branch in the lower temporal quadrant pn the Optos image than the Clarus image. In contrast, when compared with the Optos image, an additional branch was identified in the upper nasal quadrant and two additional branches in the lower nasal quadrant in the Clarus image. Therefore, the upper temporal and lower temporal quadrants were classified as “O > C” and the superior nasal and inferior nasal quadrants as “O < C” in this case by Rater 2.

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