scholarly journals Water Properties of Soft Contact Lenses: A Comparative Near-Infrared Study of Two Hydrogel Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jelena Munćan ◽  
Ivana Mileusnić ◽  
Jovana Šakota Rosić ◽  
Aleksandra Vasić-Milovanović ◽  
Lidija Matija
Keyword(s):  
Water Content ◽  
Near Infrared ◽  
Contact Lenses ◽  
Polymer Network ◽  
The State ◽  
Vinyl Pyrrolidone ◽  
Soft Contact ◽  
Infrared Study ◽  
Soft Contact Lenses ◽  
State Of Water

The functionality of soft contact lenses depends strongly on the water content and their water-transport ability. This study was conducted in order to examine the state of water in two sets of soft contact lenses: VSO38, pHEMA Filcon I 1, and VSO50, copolymer of HEMA and VP Filcon II 1 (HEMA = 2-hydroxy-ethyl methacrylate; VP = vinyl pyrrolidone). Hydrogel lenses were studied using near-infrared spectroscopy and the novel Aquaphotomics approach in order to determine the state of water in materials based on their near-infrared spectra. Aquaphotomics approach investigates absorption at specific vibrational bands of water’s covalent and hydrogen bonds which can provide information on how the water structure changes with the structural change of the polymer network. Principal component analysis and specific star-chart “aquagram” were used to analyse water spectral pattern in hydrogel materials. The findings show that material VSO38 has water predominantly organized in bound state, while material with higher water content, VSO50, has more free and weakly hydrogen bonded water. Our findings define in detail exact water species existing and interacting with the polymer network. The results show qualitative and quantitative possibilities of Aquaphotomics for better modelling and understanding water behaviour in hydrogel materials.

The state of water in soft contact lenses explored with near infrared spectroscopy and Aquaphotomics

NIR news ◽  
2017 ◽  
Vol 28 (6) ◽  
pp. 9-12
Author(s):  
Jelena Munćan
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Contact Lenses ◽  
Water Structure ◽  
The State ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
State Of Water ◽  
Three State Model

The structure of water in hydrogel materials of soft contact lenses was investigated by near infrared spectroscopy and Aquaphotomics. Near infrared spectroscopy offers rapid, reagent free, and nondestructive characterization of hydrogel materials, while Aquaphotomics provides detailed insight into the complex water structure inside the hydrogel consisting of many water molecular species. These findings push the limits of our knowledge beyond the current “three-state” model of water in hydrogels, while at the same time provide information about the state of the polymer itself thus justifying the “water molecular-mirror” concept of Aquaphotomics.

scholarly journals Characterization of nanophotonic soft contact lenses based on poly (2-hydroxyethyl methacrylate) and fullerene

2013 ◽  
Vol 67 (6) ◽  
pp. 861-870 ◽  
Author(s):  
Aleksandra Debeljkovic ◽  
Lidija Matija ◽  
Djuro Koruga
Keyword(s):  
Contact Lens ◽  
Near Infrared ◽  
Contact Lenses ◽  
Base Material ◽  
Optical Power ◽  
Sem Analysis ◽  
Hydroxyethyl Methacrylate ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Soft Contact Lens

This work presents comparative research of characteristics of a basic and new nanophotonic material, the latter of which was obtained by incorporation fullerene, C60, in the base material for soft contact lenses. The basic (SL38) and nanophotonic materials (SL38-A) for soft contact lenses were obtained by radical polymerization of 2-hydroxyethyl methacrylate and 2-hydroxyethyl methacrylate and fullerene, which were derived by the technology in the production lab of the company Soleko (Milan, Italy). The materials were used for production of soft contact lenses in the company Optix (Belgrade, Serbia) for the purposes of this research. Fullerene was used due to its apsorption transmission characteristics in ultraviolet, visible and near infrared spectrum. For the purposes of material characterization for potential application as soft contact lenses, network parameters were calculated and SEM analysis of the materials was performed while the optical properties of the soft contact lenses were measured by a Rotlex device. The values of the diffusion exponent, n, close to 0.5 indicated Fick's kinetics corresponding to diffusion. The investigated hydrogels could be classified as nonporous hydrogels. With Rotlex device, values of optical power and map of defects were showed. The obtained values of optical power and map of defects showed that the optical power of synthesized nanophotonic soft contact lens is identical to the nominal value while this was not the case for the basic lens. Also, the quality of the nanophotonic soft contact lens is better than the basic soft contact lens. Hence, it is possible to synthesize new nanophotonic soft contact lenses of desired optical characteristics, implying possibilities for their application in this field.

Disinfection of trial mid water content soft contact lenses in the practice: The efficacy of sodium dichloroisocyanurate

1992 ◽  
Vol 15 (3) ◽  
pp. 103-107 ◽  
Author(s):  
W. Houdijn Beekhuis ◽  
Fred A.G.J. Eggink ◽  
Willem Vreugdenhil ◽  
Gert-Jan Platenkamp ◽  
Johannes Buitenwerf
Keyword(s):  
Water Content ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Sodium Dichloroisocyanurate

scholarly journals The influence of water content and ionicity on the efficacy of soft contact lens care regimens on Pseudomonas aeruginosa

2021 ◽  
Vol 80 (1) ◽  
Author(s):  
Rekha Hansraj ◽  
Siddeeqa Jhetam ◽  
Jared Haridutt ◽  
Tymon Lahner ◽  
Sthabile Madlala ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Water Content ◽  
Contact Lens ◽  
Contact Lenses ◽  
High Water ◽  
Health Science ◽  
High Water Content ◽  
Three Solutions ◽  
Soft Contact ◽  
Soft Contact Lenses

Background: Contact lens care regimens appear to be prescribed based on familiarity or by matching contact lens brands rather than consideration to efficacy.Aim: This study compared the effectiveness of multipurpose and peroxide cleaning solutions on low- and high-water content ionic and non-ionic soft contact lenses, in removing Pseudomonas aeruginosa (P. aeruginosa).Setting: The laboratory work was conducted by health science students in a graduate level programme in the microbiology laboratory at a university in south-eastern South Africa.Methods: A quantitative analytical experimental design was used. Four groups (labelled I, II, III and IV) of soft contact lenses, varied ionicity and water content were inoculated with P. aeruginosa and then exposed to three solutions containing antimicrobial ingredients, polyaminopropyl biguanide (Dymed), hydrogen peroxide (H2O2) and polyquaternium-1 (Polyquad). Each group contained 14 soft contact lenses, with the exception of Group III in which eight lenses were used. Saline served as the control. After 18 h, the remaining colony-forming units were counted using visual inspection as an indicator of efficacy against P. aeruginosa.Results: The solution containing H2O2 was found to be the most effective in removing P. aeruginosa from all Food and Drug Administration (FDA) groups of contact lenses whilst Dymed was found to be comparatively ineffective for this organism. Water content and ionicity had no effect on the efficacy of the solutions.Conclusion: Practitioners should consider the efficacy of the active ingredients against microorganisms when dispensing contact lens solutions, particularly for contact lens wearers at risk for P. aeruginosa infections.

The State of Eyewash Solution Use and Parameter Changes in Clear Soft Contact Lenses from Repeated Solution Use

2018 ◽  
Vol 23 (2) ◽  
pp. 97-110 ◽  
Author(s):  
Hyun Dong Choi ◽  
Yoo Jung Kim ◽  
Suyeon Choi ◽  
Jang Cheol Shin ◽  
Mijung Park ◽  
...  
Keyword(s):  
Contact Lenses ◽  
The State ◽  
Soft Contact ◽  
Soft Contact Lenses
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