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This study concerns the anatomical, morphometrical, histological and histochemical examination of the eye tunics, eyelids and orbital glands in the three adult <jats:italic>Choloepus didactylus<\/jats:italic> coming from the Wroclaw Zoological Garden. The cornea consists of four layers since Bowman's membrane was absent. The presence of palisades of Vogt formed from 14\/15 to 20\/21 layers of epithelial cells was demonstrated. Macroscopically, the <jats:italic>tapetum lucidum<\/jats:italic> was not identified, while degenerative <jats:italic>choroidal tapetum lucidum cellulosum<\/jats:italic> was found microscopically. The ciliary muscle was found with our histological approach. The pupil was round in shape (post\u2010mortem). The presence of tarsal glands has not been demonstrated in both eyelids. The conjunctiva\u2010associated lymphoid tissue (CALT) has been shown in the upper and lower eyelids. The superficial gland of the third eyelid produced a seromucous secretion. The third eyelid was shaped like a curved arch and composed of hyaline cartilage. The deep gland of the third eyelid was big and multilobar acinar simple with serous character. The lacrimal gland produced mucous secretion. The results of our research indicate that the features of the eye anatomy in the southern two\u2010toed sloth (<jats:italic>C.\u2009didactylus<\/jats:italic>) are also typical of the Folivora suborder and have common features and differences with Vermilingua.<\/jats:p>","DOI":"10.1111\/ahe.12984","type":"journal-article","created":{"date-parts":[[2023,10,12]],"date-time":"2023-10-12T07:24:49Z","timestamp":1697095489000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The organ of vision morphology of the southern two\u2010toed sloth (<i>Choloepus didactylus<\/i> Linnaeus, 1758; Pilosa, Choloepodidae)"],"prefix":"10.1111","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1154-8736","authenticated-orcid":false,"given":"Joanna","family":"Kle\u0107kowska\u2010Nawrot","sequence":"first","affiliation":[{"name":"Department of Biostructure and Animal Physiology, Faculty of Veterinary Medicine Wroclaw University of Environmental and Life Sciences  Wroclaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karolina","family":"Barszcz","sequence":"additional","affiliation":[{"name":"Department of Morphological Sciences, Institute of Veterinary Medicine Warsaw University of Life Sciences\u2013SGGW  Warsaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8048-8031","authenticated-orcid":false,"given":"Krzysztof O.","family":"Stegmann","sequence":"additional","affiliation":[{"name":"Wroclaw Zoological Garden  Wroclaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4412-1966","authenticated-orcid":false,"given":"Karolina","family":"Go\u017adziewska\u2010Har\u0142ajczuk","sequence":"additional","affiliation":[{"name":"Department of Biostructure and Animal Physiology, Faculty of Veterinary Medicine Wroclaw University of Environmental and Life Sciences  Wroclaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,10,12]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.2307\/3504332"},{"key":"e_1_2_9_3_1","volume-title":"The evolution of armadillos, sloths, and Vermilinguas","author":"Aiello A.","year":"1985"},{"key":"e_1_2_9_4_1","volume-title":"Experimental study of two peculiar structures of the armadillo Chaetophractus villosus: The Onuf's nucleus and the Harderian gland","author":"Aldana Marcos H. 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