Abstract
If a convex body in \({\mathcal{K} \in \mathbb{R}^{n}}\) subtends constant visual angles over two concentric spheres exterior to \({\mathcal{K}}\), then it is a ball concentric to those spheres.
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Kurusa, Á., Ódor, T. Isoptic characterization of spheres. J. Geom. 106, 63–73 (2015). https://doi.org/10.1007/s00022-014-0232-4
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DOI: https://doi.org/10.1007/s00022-014-0232-4