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Carpena-Torres C, Ferrando E, García-García C, Romaguera M, Huete-Toral F, Carracedo G. In Vitro Evaluation of Soft Contact Lens Wettability With a Nonmodified Commercial Videokeratoscope. Eye Contact Lens 2024; 50:177-182. [PMID: 38305377 DOI: 10.1097/icl.0000000000001074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/07/2023] [Indexed: 02/03/2024]
Abstract
PURPOSE To evaluate a new in vitro technique for measuring soft contact lens wettability using a nonmodified commercial videokeratoscope, the Medmont E300. To this end, the capability of different artificial tears containing hyaluronic acid (HA) to improve soft contact lens wettability in vitro was investigated. METHODS An experimental in vitro study was conducted to assess the wetting properties of three artificial tears containing different concentrations of HA (0.1%, 0.2%, and 0.3%) on soft contact lenses. A saline solution was used as the control. For each solution, 15 hydrogel (Ocufilcon D) contact lenses and 15 silicone-hydrogel (Somofilcon A) contact lenses were evaluated. The in vitro wettability of the lenses was measured using the Medmont E300 with a self-developed technique, which involved measuring the tear film surface quality (TFSQ) mean, TFSQ area, TFSQ central, and TFSQ inferior. RESULTS Compared with the saline solution, all the concentration of HA (0.1%, 0.2%, and 0.3%) improved the in vitro wettability of both soft contact lenses by decreasing their TFSQ mean and TFSQ area ( P <0.05). Regression models revealed an exponential relationship between contact lens wettability and the concentration of HA for both soft contact lenses ( R >0.5, P <0.05). Furthermore, the hydrogel contact lens presented a wetter surface than the silicone-hydrogel contact lens ( P <0.05). CONCLUSIONS The measurement of in vitro wettability of soft contact lenses with a nonmodified Medmont E300 seems to be a useful technique to evaluate the wetting properties of contact lens products.
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Affiliation(s)
- Carlos Carpena-Torres
- Ocupharm Research Group (C.C.-T., E.F., C.G.-G., M.R., G.C.), Department of Optometry and Vision, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain; and Ocupharm Research Group (F.H.-T.), Department of Biochemistry and Molecular Biology, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
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Pastrana C, Carpena-Torres C, Rodríguez-Pomar C, Martin-Gil A, Carracedo G. Improvement of Soft Contact Lens Wettability After the Instillation of Hyaluronic Acid Eye Drops. Eye Contact Lens 2023; 49:120-126. [PMID: 36700614 DOI: 10.1097/icl.0000000000000955] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/19/2022] [Indexed: 01/27/2023]
Abstract
PURPOSE To evaluate the effect of the topical instillation of hyaluronic acid eye drops with different viscosity on soft contact lens wettability and comfort. METHODS A randomized and participant-masked study was performed, involving 20 participants (25.4±2.6 years). One eye wore hydrogel (ocufilcon D) contact lenses, and another eye wore silicone-hydrogel (somofilcon A) contact lenses. The in vivo wettability tear film surface quality (TFSQ) index and comfort were measured before and after the instillation of different eye drops: saline solution (control) and 0.1%, 0.2%, and 0.3% hyaluronic acid. RESULTS Compared with saline solution, the instillation of 0.1%, 0.2%, and 0.3% hyaluronic acid improved the in vivo wettability of the hydrogel contact lenses by decreasing their TFSQ mean for 5, 10, and 30 min, respectively ( P <0.05). During silicone-hydrogel contact lens wear, the hyaluronic acid did not affect wettability because there were no changes in TFSQ mean ( P ≥0.05), but the 0.3% hyaluronic acid produced a decrease in comfort for the first 3 min ( P <0.05). CONCLUSIONS The instillation of hyaluronic acid eye drops increased the in vivo wettability of the hydrogel contact lens, and the duration of this effect was directly related to its concentration and viscosity.
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Affiliation(s)
- Cristina Pastrana
- Ocupharm Research Group, Department of Optometry and Vision, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
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Marx S, Baluschev S, Sickenberger W. Solution-related in Vitro Dewetting Behavior of Various Daily Disposable Contact Lenses. Optom Vis Sci 2022; 99:750-757. [PMID: 36095059 PMCID: PMC9553268 DOI: 10.1097/opx.0000000000001939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
SIGNIFICANCE 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. PURPOSE 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. METHODS 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. RESULTS 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). CONCLUSIONS 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.
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Affiliation(s)
- Sebastian Marx
- JenVis Research GbR, Jena, Germany
- Faculty of Physics, Sofia University, Sofia, Bulgaria
| | - Stanislav Baluschev
- Faculty of Physics, Sofia University, Sofia, Bulgaria
- Max Planck Institute for Polymer Research, Mainz, Germany
| | - Wolfgang Sickenberger
- JenVis Research GbR, Jena, Germany
- Ernst Abbe University of Applied Sciences, Jena, Germany
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Iwashita H, Mabuchi K, Itokawa T, Okajima Y, Suzuki T, Hori Y. Evaluation of the Lubricating Effect of Hyaluronic Acid on Contact Lenses Using a Pendulum-Type Friction Tester Under Mimicking Physiological Conditions. Eye Contact Lens 2022; 48:83-87. [PMID: 35058419 PMCID: PMC8759543 DOI: 10.1097/icl.0000000000000853] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/12/2021] [Indexed: 12/02/2022]
Abstract
OBJECTIVE To evaluate the lubricating effect of hyaluronic acid (HA) on soft contact lenses (SCLs) measured using a pendulum-type friction tester. METHODS We measured the coefficient of friction (CoF) of narafilcon A, delefilcon A, and etafilcon A with polyvinylpyrrolidone (PVP), daily disposable SCL material, using a modified pendulum-type friction tester. Sample SCLs were set on an acrylic plastic half-ball and placed into the polyethylene terephthalate hemisphere cup filled with 0.4 mL of test lubricants that included saline and 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% (wt/vol) HA (molecular weight, 850 kDa). The viscosities of saline and HA were measured using an Ubbelohde viscometer. RESULTS The CoF of the SCL under a low concentration (0.05%) of HA was the lowest and significantly lower than saline in narafilcon A and delefilcon A (P<0.05, Steel multiple comparison test). Under higher HA concentrations (0.3%, 0.4%, and 0.5%), the CoF was significantly higher than that of saline (P<0.01, Steel' multiple comparison test) in all three SCLs. There were no significant differences of CoF among three SCLs in saline and all concentrations of HA. The HA viscosities increased exponentially with the concentration (Y=1.2829e9.286X). CONCLUSION The viscosity of a high concentration of HA may increase the friction of SCLs, which may have a deleterious effect on the ocular surface.
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Affiliation(s)
- Hiroko Iwashita
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
| | - Kiyoshi Mabuchi
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
| | - Takashi Itokawa
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
| | - Yukinobu Okajima
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
| | - Takashi Suzuki
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
| | - Yuichi Hori
- Department of Ophthalmology (H.I., K.M., T.I., Y.O., T.S., Y.H.), Faculty of Medicine, Toho University, Tokyo, Japan; and Department of Biomedical Engineering (K.M.), School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
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Influence of Selected Ophthalmic Fluids on the Wettability and Hydration of Hydrogel and Silicone Hydrogel Contact Lenses—In Vitro Study. MATERIALS 2022; 15:ma15030930. [PMID: 35160876 PMCID: PMC8839750 DOI: 10.3390/ma15030930] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/11/2022] [Accepted: 01/20/2022] [Indexed: 11/16/2022]
Abstract
This study attempts to evaluate the effect of incubation in selected ophthalmic fluids on contact lenses (Etafilcon A, Omafilcon A, Narafilcon A, Senofilcon A). Four research groups differing in the incubation environment were created: (1) initial state, (2) contact lens solution (CLS), (3) contact lens solution and eye drops (ED) and (4) eye drops. Dehydration by gravimetric method and the contact angle (CA) by the sessile drop method were tested. The surface free energy (SFE) was also calculated with the use of several methods: Owens–Wendt, Wu, Neumann, and Neumann–Kwok. The greatest changes in the dehydration profile were observed for contact lenses incubated in ED. The most noticeable changes in CA values were observed for contact lenses incubated in ED, in which it was not possible to settle water drop after incubation. On the basis of SFE analysis, higher values were found for hydrogel contact lenses, e.g., according to the Owens–Wendt method, they ranged from 54.45 ± 6.56 mJ/m2 to 58.09 ± 4.86 mJ/m2, while in the case of silicone-hydrogel contact lenses, they ranged from 32.86 ± 3.47 mJ/m2 to 35.33 ± 6.56 mJ/m2. Incubation in all tested environments decreased the SFE values, but the differences were in most cases statistically insignificant. Calculating the SFE may be a useful method as it can be used to estimate the possibility of bacteria adhering to contact lens surfaces.
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Itokawa T, Suzuki T, Iwashita H, Hori Y. Comparison and Evaluation of Prelens Tear Film Stability by Different Noninvasive in vivo Methods. Clin Ophthalmol 2020; 14:4459-4468. [PMID: 33376300 PMCID: PMC7762444 DOI: 10.2147/opth.s288047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 12/09/2020] [Indexed: 12/16/2022] Open
Abstract
Purpose Prelens tear film stability of soft contact lens (SCL) play an important role for contact lens discomfort. In this study, we investigated the association between two types of noninvasive methods and evaluated the tear film stability with SCL using the methods. Patients and Methods In experiment 1, images of ring mire were recorded with a keratograph after focusing the pigment located at the front or back of the SCL. Interferometry and videokeratoscopy were used for the assessment of tear film stability in the right eye of 10 women, with two different cosmetic daily disposable SCLs: polymacon and etafilcon A with polyvinylpyrrolidone. Time to first distortion by noninvasive keratograph break up time (NIKBUT-first) was compared to noninvasive interferometry break up time (NIBUT). In experiment 2, ten normal females wore two different daily disposable SCLs: samfilcon A and narafilcon A. NIKBUT-first and NIBUT were compared between the lenses after 8 hours of SCL wearing. Results In experiment 1, NIBUT-first without SCL was significantly correlated to NIBUT without SCL (r=0.445, P=0.0488, Pearson’s correlation coefficients). However, NIKBUT-first with SCL was not significantly correlated with NIBUT with SCL. In experiment 2, although NIKBUT-first was not significantly different between SCLs, samfilcon A had significantly longer NIBUT than narafilcon A (P=0.0315, paired t-test). Conclusion NIKBUT-first with SCL could be related to tear film stability between the lens and the corneal surface, but not to prelens tear film stability. NIIBUT could be a suitable method to evaluate prelens tear stability.
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Affiliation(s)
- Takashi Itokawa
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan.,Department of Ophthalmology, School of Medicine, Toho University, Tokyo, Japan
| | - Takashi Suzuki
- Department of Ophthalmology, School of Medicine, Toho University, Tokyo, Japan.,Ishizuchi Eye Clinic, Niihama, Ehime, Japan
| | - Hiroko Iwashita
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan
| | - Yuichi Hori
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan.,Department of Ophthalmology, School of Medicine, Toho University, Tokyo, Japan
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