Six external recti muscles chosen from a material of 20 muscles were studied with the transmission electron microscope. The specimens were obtained during enucleation procedure. All of the patients suffered from diabetes mellitus. Specimens of non-diabetic patients of the same age group were used as controls. The age-related changes were less distinct than those found in the diabetic material. In diabetes muscular atrophy dominated and serious signs of vasculopathy were present.
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