Solution-related in Vitro Dewetting Behavior of Various Daily Disposable Contact Lenses. 2022

Sebastian Marx, and Stanislav Baluschev, and Wolfgang Sickenberger

The dewetting process of contact lenses (CLs) is a result of material and solution properties as well as environmental factors. This article describes an investigational approach to observe and describe dewetting characteristics of different CL material and solution combinations. This study aimed to determine the in vitro dewetting characteristics of various daily disposable CLs that were assessed using a noninvasive keratograph dewetting procedure (noninvasive keratograph dry-up time). In vitro dewetting data of the same CL materials soaked in saline solution and artificial tear solution (ATS) were measured to determine additional dewetting characteristics. Noninvasive keratograph dry-up time was measured for six different soft CL materials and three different test conditions, in their specific blister solution, after exposure to saline and an ATS. Twenty CLs of each solution/material combination were assessed after an 8-hour soaking, during a 180-second dewetting observation, and the results were expressed by area under the curve values. Fastest dewetting occurred for all materials when measured out of saline, indicated by the highest averaged area under the curve value of 9243.3 ± 38.3 over all lens materials. Slower dewetting was detected for all materials when measured out of their specific blister solution (7755.9 ± 37.1) and out of ATS (7988.8 ± 40.0). Intragroup results were statistically significantly different for all solutions showing the smallest differences within the ATS group ( P < .001, Kruskal-Wallis test). A pure saline thin film is not an ideal representation of a complex tear film layer of a healthy human because it lacks any evaporative protection by a lipid layer. The use of an ATS, which more likely mimics the natural tear film, allowed in this experimental in vitro project to decrease the gap to the in vivo field. In vitro dewetting information in connection with the blister solution allows only a theoretical conclusion about the initial lens wear after lens insertion.

UI MeSH Term Description Entries
D008055 Lipids A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed) Lipid
D001768 Blister Visible accumulations of fluid within or beneath the epidermis. Bulla,Vesication,Bleb,Bullae,Bullous Lesion,Blebs,Blisters,Bullous Lesions,Lesion, Bullous,Lesions, Bullous,Vesications
D003263 Contact Lenses, Hydrophilic Soft, supple contact lenses made of plastic polymers which interact readily with water molecules. Many types are available, including continuous and extended-wear versions, which are gas-permeable and easily sterilized. Lenses, Contact, Hydrophilic,Soft Contact Lenses,Hydrophilic Contact Lens,Soft Contact Lens,Contact Lens, Hydrophilic,Contact Lens, Soft,Contact Lenses, Soft,Hydrophilic Contact Lenses,Lens, Hydrophilic Contact,Lens, Soft Contact,Lenses, Hydrophilic Contact,Lenses, Soft Contact
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000077330 Saline Solution A crystalloid solution that contains 9.0g of SODIUM CHLORIDE per liter of water. It has a variety of uses, including: as a CONTACT LENS SOLUTION, in OPHTHALMIC SOLUTIONS and NASAL LAVAGE, in wound irrigation, and for FLUID THERAPY. 0.9% NaCl,0.9% Saline,Normal Saline,Saline, 0.9%,Saline, Normal
D013666 Tears The fluid secreted by the lacrimal glands. This fluid moistens the CONJUNCTIVA and CORNEA. Meibomian Lipids,Meibum,Lipid, Meibomian,Meibomian Lipid,Tear
D065346 Lubricant Eye Drops Ophthalmic solutions that include LUBRICANTS and WETTING AGENTS such as POLYETHYLENE GLYCOL; HYPROMELLOSE; GLYCEROL; PROPYLENE GLYCOL. They are used to treat conditions caused by deficient tear production such as DRY EYE SYNDROME. Artificial Tear,Artificial Tears,Lubricant Eye Drop,Lubricating Eye Drop,Tears, Artificial,Lubricating Eye Drops,Drop, Lubricant Eye,Drop, Lubricating Eye,Drops, Lubricant Eye,Drops, Lubricating Eye,Eye Drop, Lubricant,Eye Drop, Lubricating,Eye Drops, Lubricant,Eye Drops, Lubricating,Tear, Artificial

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