Clinical pathology: Rectification of width and area of the ciliary cleft in dogs

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  • KAWATA Manabu
    Laboratory of Advanced Diagnosis and Treatment, Department of Advanced Clinical Medicine, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • TSUKIZAWA Hisae
    Laboratory of Advanced Diagnosis and Treatment, Department of Advanced Clinical Medicine, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • NAKAYAMA Masanari
    Laboratory of Advanced Diagnosis and Treatment, Department of Advanced Clinical Medicine, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University Nakayama Veterinary Hospital
  • HASEGAWA Takashi
    Laboratory of Advanced Diagnosis and Treatment, Department of Advanced Clinical Medicine, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University

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  • Rectification of Width and Area of the Ciliary Cleft in Dogs

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The width and area of the ciliary cleft (CCW and CCA) according to ultrasound biomicroscopy was rectified to compare dogs of different body sizes/weights, including toy breed (TBG), small breed (SBG), medium breed (MBG) and large/giant breed groups (LGBG). A linear correlation was detected between the natural log of body weight and the ocular axial length (OAL) reflecting the ocular size (OS; r=0.81, p<0.001). A significant positive correlation was found between OAL and the distance of the Schwalbe's line to the anterior lenticular capsule (SLD; r=0.87, p<0.001), suggesting that SLD could rectify canine OS. Rectified CCW (r-CCW) and CCA (r-CCA) were calculated using SLD and fixed SLD as the SLD mean (SLDM). The SLDM was 2.55 mm in this study, and r-CCW and r-CCA were calculated as r-CCW = CCW × (2.55/SLD) and r-CCA = CCA × (2.55/SLD)2. The CCW values of TBG, SBG and MBG were narrower than those of LGBG (p<0.05). There were significant statistical differences in CCA between all groups other than TBG and SBG (p<0.05). There were no significant differences in r-CCW and r-CCA in any of the groups. In addition, CCW/SLD did not show significant changes in dogs with different body sizes/weights. These results suggested that r-CCW, r-CCA and CCW/SLD can be used for comparison between dogs of different body sizes/weights.<br>

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