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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 (http://creativecommons.org/licenses/by/4.0/).
Diagram of the eye lens, showing the location of the lens cortex, nucleus, epithelial cells, and layers composed of hundreds of fiber cells. Fiber cells are extremely long, stretching from anterior to posterior.