Spontaneous Blinking from a Tribological Viewpoint
Spontaneous Blinking from a Tribological Viewpoint
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DOI：
10.1016/j.jtos.2014.12.004
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发表时间：
2015-07-01
期刊：
影响因子：
6.4
通讯作者：
Murphy, Paul J.
中科院分区：
文献类型：
--
作者：
Pult, Heiko;Tosatti, Samuele G. P.;Murphy, Paul J.
据报道，擦盖器与眼表之间以及隐形眼镜与擦盖器之间的机械力与干眼症状有关。此外，这些滑动伙伴之间的机械力被认为与眼睑擦拭性上皮病（LWE）和眼睑平行结膜褶皱（LIPCOF）的眼部体征有关。最近的文献提供了一些证据，表明低摩擦系数（CoF）的隐形眼镜通过减少隐形眼镜表面和雨刷之间的机械力来改善佩戴舒适性。本文从摩擦学的角度讨论了健康受试者在低滑动速度和高滑动速度下自发眨眼时的机械力。结论是，在低滑动速度下，眼表面的摩擦系数似乎与亲水性聚合物刷的摩擦系数有很强的可比性，并且随着滑动速度的增加，由于两个滑动伙伴之间存在流体膜，在滑动伙伴的表面没有磨损。相反，在干眼症的情况下，在高眨眼速度下不能保持完全的液膜润滑可能导致剪切速率增加，导致滑动副变形和磨损。这些剪切速率很可能与撕裂膜粘度有关。
The mechanical forces between the lid wiper and the ocular surface, and between a contact lens and the lid wiper, are reported to be related to dry eye symptoms. Furthermore, the mechanical forces between these sliding partners are assumed to be related to the ocular signs of lidwiper epitheliopathy (LWE) and lid-parallel conjunctival folds (LIPCOF). Recent literature provides some evidence that a contact lens with a low coefficient of friction (CoF) improves wearing comfort by reducing the mechanical forces between the contact lens surface and the lid wiper. This review discusses the mechanical forces during spontaneous blinks from a tribological perspective, at both low and high sliding velocities, in a healthy subject. It concludes that the coefficient of friction of the ocular surfaces appears to be strongly comparable to that of hydrophilic polymer brushes at low sliding velocity, and that, with increased sliding velocity, there is no wear at the sliding partners' surfaces thanks to the presence of a fluid film between the two sliding partners. In contrast, in the case of dry eye, the failure to maintain a full fluid film lubrication regime at high blinking speeds may lead to increased shear rates, resulting in deformation and wear of the sliding pairs. These shear rates are most likely related to tear film viscosity.