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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
An adaptive optics image of photoreceptors in an eye affected by cone–rod dystrophy (Rtx1™, Imagine Eyes, France). Throughout the image, the cones are not clearly visible. Observe the “dark spaces” scattered within the cone mosaic across various regions of the picture.