Publicação
Influence of lens care solutions on transmittance and reflectance of contact lenses
| Resumo: | Relevance: The transmittance is an optical property of contact lenses (CLs) that represents the amount of refracted light. This attribute displays interest in issues related to protection against ultraviolet radiation (UVR) and visual performance of lenses. Currently, epidemiological and experimental evidence exists for the role of UVR phototoxicity in pathological changes to the ocular tissues. When placed in solutions, previous studies have shown that some combinations result in significant changes in the CLs properties, including in the optical domain. Purpose: To investigate the effects of four lens care solutions on transmittance and reflectance of five contact lenses materials, analyzing the lenses before and after storage. Methods: From a cohort study, triplicate measurements of tansmittance and reflectance of CLs was evaluated after 8 hours, 1 day and 1 week of storage with three multipurpose solutions (MPSs: ReNu MultiPlus® MPS, Biotrue™ and Optifree® PureMoist®) and one hydrogen peroxide system (AOSept® Plus). The lenses used in this study were Acuvue Oasys™, Air Optix Aqua™, Purevision® 2, Biofinity™ and one conventional hydrogel material, Proclear™. The outcomes were provided by Shimadzu UV3101-PC UV-vis-NIR spectrophotometer equipped with an integrating sphere, between 200-700 nm. The fluorescence variables of solutions were performed by SPEX-Fluorolog 2 FL3-22 spectrofluorometer to assess the effects of materials in the products. Results: After immersed in the different solutions, all the materials exhibited a greater or lesser statistically significant differences on study variables over time. The Comfilcon A showed the lowest UVA & UVB attenuation. Balafilcon A and Lotrafilcon B displayed a considerable suppression of UV radiation. Senofilcon A was effective in UVR protection and showed less effect on the fluorescence of liquids. Overall, the reflectance decreased after storage. In the LCSs, the outcomes of AOSept absorbance and fluorescence demonstrated lower affection in relation to MPSs solutions and Lotrafilcon B displayed greater changes in all study variables compared with the other materials. Conclusion: Significant differences on transmittance were found after storage, probably due to the intractions with the products. AOSept showed greater strength to CLs effect compared with MPSs. The changes exhibited in the visible spectrum have no implications on visual performance. |
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| Autores principais: | Alves, Micael Moreira |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2019 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Relevance: The transmittance is an optical property of contact lenses (CLs) that represents the amount of refracted light. This attribute displays interest in issues related to protection against ultraviolet radiation (UVR) and visual performance of lenses. Currently, epidemiological and experimental evidence exists for the role of UVR phototoxicity in pathological changes to the ocular tissues. When placed in solutions, previous studies have shown that some combinations result in significant changes in the CLs properties, including in the optical domain. Purpose: To investigate the effects of four lens care solutions on transmittance and reflectance of five contact lenses materials, analyzing the lenses before and after storage. Methods: From a cohort study, triplicate measurements of tansmittance and reflectance of CLs was evaluated after 8 hours, 1 day and 1 week of storage with three multipurpose solutions (MPSs: ReNu MultiPlus® MPS, Biotrue™ and Optifree® PureMoist®) and one hydrogen peroxide system (AOSept® Plus). The lenses used in this study were Acuvue Oasys™, Air Optix Aqua™, Purevision® 2, Biofinity™ and one conventional hydrogel material, Proclear™. The outcomes were provided by Shimadzu UV3101-PC UV-vis-NIR spectrophotometer equipped with an integrating sphere, between 200-700 nm. The fluorescence variables of solutions were performed by SPEX-Fluorolog 2 FL3-22 spectrofluorometer to assess the effects of materials in the products. Results: After immersed in the different solutions, all the materials exhibited a greater or lesser statistically significant differences on study variables over time. The Comfilcon A showed the lowest UVA & UVB attenuation. Balafilcon A and Lotrafilcon B displayed a considerable suppression of UV radiation. Senofilcon A was effective in UVR protection and showed less effect on the fluorescence of liquids. Overall, the reflectance decreased after storage. In the LCSs, the outcomes of AOSept absorbance and fluorescence demonstrated lower affection in relation to MPSs solutions and Lotrafilcon B displayed greater changes in all study variables compared with the other materials. Conclusion: Significant differences on transmittance were found after storage, probably due to the intractions with the products. AOSept showed greater strength to CLs effect compared with MPSs. The changes exhibited in the visible spectrum have no implications on visual performance. |
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