Evaluation of changes in lacrimal canaliculi width depending on temperature and viscosity of eye drops using spectral-domain optical coherence tomography in dogs

To evaluate the changes in the width of the lower lacrimal canaliculi (LC) upon instillation of artificial tears (AT) at different temperatures and viscosities using spectral-domain optical coherence tomography (SD-OCT). Eight eyes of four client-owned adult dogs. Imaging of lower LC was performed u...

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Published in:Veterinary ophthalmology 2024-06
Main Authors: Sung, Hyeonu, Kang, Seonmi, Lee, Songhui, Jang, Yeajin, Kim, Giyeon, Kim, Yujin, Seo, Kangmoon
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Kang, Seonmi
Lee, Songhui
Jang, Yeajin
Kim, Giyeon
Kim, Yujin
Seo, Kangmoon
description To evaluate the changes in the width of the lower lacrimal canaliculi (LC) upon instillation of artificial tears (AT) at different temperatures and viscosities using spectral-domain optical coherence tomography (SD-OCT). Eight eyes of four client-owned adult dogs. Imaging of lower LC was performed under general anesthesia. AT at temperatures of 2°C, 20°C, and 38°C, and a high-viscosity tear gel of 20°C, were topically instilled in 100 μL volumes. SD-OCT tracked LC width changes following each instillation. The average baseline width of the LC was 96.38 ± 30.18 μm. The 2°C AT expanded LC width to 183.50 ± 44.11 μm, returning to baseline in 5.00 ± 1.31 min. The 20°C AT resulted in a width of 155.25 ± 35.79 μm, with a 3.88 ± 1.25 min return. The 38°C AT expanded LC width to 131.75 ± 29.49 μm, with a 2.25 ± 0.89 min return. The high-viscosity tear gel expanded LC width to 208.57 ± 56.31 μm, with remained expanded for 10 or more minutes. In temperature comparisons, the 2°C and 20°C AT significantly expanded the LC width more and had longer return times than the 38°C AT (p 
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Eight eyes of four client-owned adult dogs. Imaging of lower LC was performed under general anesthesia. AT at temperatures of 2°C, 20°C, and 38°C, and a high-viscosity tear gel of 20°C, were topically instilled in 100 μL volumes. SD-OCT tracked LC width changes following each instillation. The average baseline width of the LC was 96.38 ± 30.18 μm. The 2°C AT expanded LC width to 183.50 ± 44.11 μm, returning to baseline in 5.00 ± 1.31 min. The 20°C AT resulted in a width of 155.25 ± 35.79 μm, with a 3.88 ± 1.25 min return. The 38°C AT expanded LC width to 131.75 ± 29.49 μm, with a 2.25 ± 0.89 min return. The high-viscosity tear gel expanded LC width to 208.57 ± 56.31 μm, with remained expanded for 10 or more minutes. In temperature comparisons, the 2°C and 20°C AT significantly expanded the LC width more and had longer return times than the 38°C AT (p &lt; .05). Viscosity comparisons showed higher viscosity eye drops significantly expanded LC width more than lower viscosity eye drops (p &lt; .05). This study found that lower temperature and higher viscosity of eye drops had tendency to result in a wider expansion of the LC width. Additionally, the return time to baseline for LC width tended to be longer with eye drops of lower temperature and higher viscosity. 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Viscosity comparisons showed higher viscosity eye drops significantly expanded LC width more than lower viscosity eye drops (p &lt; .05). This study found that lower temperature and higher viscosity of eye drops had tendency to result in a wider expansion of the LC width. Additionally, the return time to baseline for LC width tended to be longer with eye drops of lower temperature and higher viscosity. 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Viscosity comparisons showed higher viscosity eye drops significantly expanded LC width more than lower viscosity eye drops (p &lt; .05). This study found that lower temperature and higher viscosity of eye drops had tendency to result in a wider expansion of the LC width. Additionally, the return time to baseline for LC width tended to be longer with eye drops of lower temperature and higher viscosity. This finding could be helpful in advancing future research on tear dynamics.</abstract><cop>England</cop><pmid>38900691</pmid><doi>10.1111/vop.13250</doi><orcidid>https://orcid.org/0009-0009-2567-7994</orcidid><orcidid>https://orcid.org/0000-0002-1826-8924</orcidid><orcidid>https://orcid.org/0000-0001-8017-0891</orcidid><orcidid>https://orcid.org/0009-0007-6304-3293</orcidid><orcidid>https://orcid.org/0000-0001-6645-7116</orcidid><orcidid>https://orcid.org/0009-0006-9969-8390</orcidid><orcidid>https://orcid.org/0009-0000-4943-3649</orcidid></addata></record>
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title Evaluation of changes in lacrimal canaliculi width depending on temperature and viscosity of eye drops using spectral-domain optical coherence tomography in dogs
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