Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy.
Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via Arnesano, Lecce 73100, Italy; Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, Lecce 73100, Italy.
Colloids Surf B Biointerfaces. 2024 Jan;233:113630. doi: 10.1016/j.colsurfb.2023.113630. Epub 2023 Nov 4.
Contact Lens Discomfort (CLD) is the main cause in contact lens (CLs) discontinuation, referred in literature as drop-out phenomenon. Despite such evidence was reported in several clinical studies, a relationship between physico-chemical properties of CLs and CLD is not still totally understood. In this regard, the friction of CLs surfaces seems to be related to discomfort feeling events, probably due to an alteration of the lubricate function of the tear film after the CL placement inside the ocular environment. In the last years, many studies have been finalized to the friction measurements of CLs surface, finding conflicting data due to a lack in standardized protocol. The aim of this review is primarily to show evident relationships between CLs surface properties (i.e. wettability, tear evaporation, tear film quality, etc.) and the coefficient of friction (CoF), resulting therefore the most relevant physical quantity in the CLs characterization. In addition, we reported the most recent studies in CLs tribology, which highlight that the introduction of a standard protocol in CoF measurements is necessary to obtain reproducible results, considering the aim to evaluate in a more precise way the relationship between this material surface property and comfort in CLs users.
接触镜不适（CLD）是导致接触镜（CLs）停止使用的主要原因，在文献中称为脱落现象。尽管在几项临床研究中报告了这样的证据，但 CLs 的理化特性与 CLD 之间的关系尚未完全理解。在这方面，CLs 表面的摩擦力似乎与不适感觉事件有关，可能是由于 CL 放置在眼内环境后泪膜的润滑功能发生改变。近年来，许多研究都致力于 CLs 表面的摩擦力测量，但由于缺乏标准化协议，得到了相互矛盾的数据。本综述的主要目的是展示 CLs 表面特性（即润湿性、泪液蒸发、泪膜质量等）与摩擦系数（CoF）之间的明显关系，因此 CoF 是 CLs 特性描述中最重要的物理量。此外，我们还报告了 CLs 摩擦学的最新研究，这些研究表明，在 CoF 测量中引入标准协议是必要的，以获得可重复的结果，考虑到目的是更精确地评估这种材料表面特性与 CLs 用户舒适度之间的关系。
