Sandra Schurig, Lucas Armster, Eric Steingruber, Sebastian Marx, W. Sickenberger
{"title":"软性隐形眼镜的温度测量","authors":"Sandra Schurig, Lucas Armster, Eric Steingruber, Sebastian Marx, W. Sickenberger","doi":"10.54352/dozv.dkor3596","DOIUrl":null,"url":null,"abstract":"Purpose. The study objective was to measure the tempera- ture-dependent change in the refractive index, base curve, and back vertex power of soft contact lenses. Material and Methods. For each material group according to ISO 18369-1 a representative soft contact lens brand was selected according to ISO 18369-1 (polymacon, nelfilcon A, ocufilcon D, balafilcon A, somofilcon A, lotrafilcon B). The parameters were measured in vitro at 20 °C and 35 °C. First, the refractive index was determined using the automatic refractometer (VariRef C, Schmidt + Haensch), followed by the base curve measurement using the OCT (is830, Opti- mec) in conjunction with the temperature controller (TC20i, Opitmec). The back vertex power difference was determined using the precision lens meter (NIMO TR1504, Lambda-X SA). Results. The following values (refractive index 20 °C // re- fractive index 35 °C; base curve 20 °C // base curve 35 °C; Li back vertex power from 20 °C to 35 °C) were obtained for the hydrogels polymacon (1.4464 // 1.4430; 8.4706 // 8.4240; −0.077 D), nelfilcon A (1.3875 // 1.3870; 8.7854 // 8.5817; −0.022 D), ocufilcon D (1.4198 // 1.4171; 8.5622 // 8.4647; −0.076 D) and the silicone hydrogels balafilcon A (1.4197 // 1.4196; 8.7205 // 8.8287; −0.016 D), somofilcon A (1.4024 // 1.4004; 8.9100 // 8.6800; −0.076 D), lotrafilcon B (1.4246 // 1.4212; 8.6791 // 8.5801; −0.091 D). All materials except balafil- con A showed a statistically significant change (p < 0.05 paired samples), related to at least two of the measured parameters. Conclusion. The materials showed a reduction in refractive index and base curve with temperature increase. The back vertex power became more negative. The changes are within the tolerances specified in ISO 18369-2. Since no clinically relevant parameter changes were observed between the dif- ferent temperatures, it is acceptable to continue the current practice and measure lens parameters at room temperatures. Keywords Contact lenses, contact lens properties, measuring temperature","PeriodicalId":347784,"journal":{"name":"Optometry & Contact Lenses","volume":"12 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Temperaturabhängige Vermessung weicher Kontaktlinsen\",\"authors\":\"Sandra Schurig, Lucas Armster, Eric Steingruber, Sebastian Marx, W. Sickenberger\",\"doi\":\"10.54352/dozv.dkor3596\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Purpose. The study objective was to measure the tempera- ture-dependent change in the refractive index, base curve, and back vertex power of soft contact lenses. Material and Methods. For each material group according to ISO 18369-1 a representative soft contact lens brand was selected according to ISO 18369-1 (polymacon, nelfilcon A, ocufilcon D, balafilcon A, somofilcon A, lotrafilcon B). The parameters were measured in vitro at 20 °C and 35 °C. First, the refractive index was determined using the automatic refractometer (VariRef C, Schmidt + Haensch), followed by the base curve measurement using the OCT (is830, Opti- mec) in conjunction with the temperature controller (TC20i, Opitmec). The back vertex power difference was determined using the precision lens meter (NIMO TR1504, Lambda-X SA). Results. The following values (refractive index 20 °C // re- fractive index 35 °C; base curve 20 °C // base curve 35 °C; Li back vertex power from 20 °C to 35 °C) were obtained for the hydrogels polymacon (1.4464 // 1.4430; 8.4706 // 8.4240; −0.077 D), nelfilcon A (1.3875 // 1.3870; 8.7854 // 8.5817; −0.022 D), ocufilcon D (1.4198 // 1.4171; 8.5622 // 8.4647; −0.076 D) and the silicone hydrogels balafilcon A (1.4197 // 1.4196; 8.7205 // 8.8287; −0.016 D), somofilcon A (1.4024 // 1.4004; 8.9100 // 8.6800; −0.076 D), lotrafilcon B (1.4246 // 1.4212; 8.6791 // 8.5801; −0.091 D). All materials except balafil- con A showed a statistically significant change (p < 0.05 paired samples), related to at least two of the measured parameters. Conclusion. The materials showed a reduction in refractive index and base curve with temperature increase. The back vertex power became more negative. The changes are within the tolerances specified in ISO 18369-2. Since no clinically relevant parameter changes were observed between the dif- ferent temperatures, it is acceptable to continue the current practice and measure lens parameters at room temperatures. 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引用次数: 0
摘要
研究目的研究目的是测量软性隐形眼镜的屈光度、基底曲线和后顶点功率随温度的变化。材料和方法。根据 ISO 18369-1 标准，为每个材料组选择了一个具有代表性的软性隐形眼镜品牌（polymacon、nelfilcon A、ocufilcon D、balafilcon A、somofilcon A、lotrafilcon B）。这些参数是在 20 °C 和 35 °C 下进行体外测量的。首先，使用自动折射仪（VariRef C，Schmidt + Haensch）测定折射率，然后使用 OCT（is830，Opti-mec）结合温度控制器（TC20i，Opitmec）测量基底曲线。使用精密透镜测量仪（NIMO TR1504，Lambda-X SA）测定后顶点功率差。结果如下水凝胶 polymacon（1.4464 // 1.4430；8.4706 // 8.4240；-0.077 D）、nelfilcon A（1.3875 // 1.3870；8.7854 // 8.5817; -0.022 D）、ocufilcon D（1.4198 // 1.4171; 8.5622 // 8.4647; -0.076 D）和硅酮水凝胶 balafilcon A（1.4197 // 1.4196; 8.7205 // 8.8287; -0.016 D)、somofilcon A (1.4024 // 1.4004; 8.9100 // 8.6800; -0.076 D)、lotrafilcon B (1.4246 // 1.4212; 8.6791 // 8.5801; -0.091 D)。除 balafil- con A 外，所有材料都显示出与至少两个测量参数相关的显著统计学变化（p < 0.05 成对样本）。结论。随着温度的升高，材料的折射率和基底曲线都有所下降。后顶点功率变得更负。这些变化都在 ISO 18369-2 规定的公差范围内。由于在不同温度下没有观察到与临床相关的参数变化，因此可以继续采用目前的做法，在室温下测量镜片参数。关键词 隐形眼镜、隐形眼镜特性、测量温度
Purpose. The study objective was to measure the tempera- ture-dependent change in the refractive index, base curve, and back vertex power of soft contact lenses. Material and Methods. For each material group according to ISO 18369-1 a representative soft contact lens brand was selected according to ISO 18369-1 (polymacon, nelfilcon A, ocufilcon D, balafilcon A, somofilcon A, lotrafilcon B). The parameters were measured in vitro at 20 °C and 35 °C. First, the refractive index was determined using the automatic refractometer (VariRef C, Schmidt + Haensch), followed by the base curve measurement using the OCT (is830, Opti- mec) in conjunction with the temperature controller (TC20i, Opitmec). The back vertex power difference was determined using the precision lens meter (NIMO TR1504, Lambda-X SA). Results. The following values (refractive index 20 °C // re- fractive index 35 °C; base curve 20 °C // base curve 35 °C; Li back vertex power from 20 °C to 35 °C) were obtained for the hydrogels polymacon (1.4464 // 1.4430; 8.4706 // 8.4240; −0.077 D), nelfilcon A (1.3875 // 1.3870; 8.7854 // 8.5817; −0.022 D), ocufilcon D (1.4198 // 1.4171; 8.5622 // 8.4647; −0.076 D) and the silicone hydrogels balafilcon A (1.4197 // 1.4196; 8.7205 // 8.8287; −0.016 D), somofilcon A (1.4024 // 1.4004; 8.9100 // 8.6800; −0.076 D), lotrafilcon B (1.4246 // 1.4212; 8.6791 // 8.5801; −0.091 D). All materials except balafil- con A showed a statistically significant change (p < 0.05 paired samples), related to at least two of the measured parameters. Conclusion. The materials showed a reduction in refractive index and base curve with temperature increase. The back vertex power became more negative. The changes are within the tolerances specified in ISO 18369-2. Since no clinically relevant parameter changes were observed between the dif- ferent temperatures, it is acceptable to continue the current practice and measure lens parameters at room temperatures. Keywords Contact lenses, contact lens properties, measuring temperature
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