Contact Lens Technology: From Fundamentals to Applications

Moreddu, Rosalia; Vigolo, Daniele; Yetisen, Ali K.

doi:10.1002/adhm.201900368

Cited by 178 publications

(191 citation statements)

References 172 publications

(202 reference statements)

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“…They lie immediate-ly above the cornea, adhering to the film of tears due to surface tension. 2 , 3 Contact lenses are of several types, each type designed to meet a different purpose. They are classified by their primary function (corrective, multifocal, monovision contact lenses) and material (rigid, soft and hybrid contact lenses).…”

Section: Conclusion Onclusionsmentioning

confidence: 99%

Knowledge and attitude of youth towards contact lenses in Karachi, Pakistan

Irfan¹,

Memon²,

Shaikh³

et al. 2019

Journal of Global Health Reports

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Back Background ground Surveys have shown that contact lenses are common optical correction devices used worldwide and they are particularly popular among the youth. However, not much is known about the knowledge and attitude of youth towards contact lenses in Pakistan. This study targeted to assess the approach of youth in Karachi towards contact lenses and whether the differences noted in approach was simulated by gender. Methods Methods We conducted a cross-sectional survey in September 2018, using convenience sampling and interviewed 400 individuals, aged 16-25, to assess their knowledge, attitude, and practices towards contact lenses. The respondents were asked about their knowledge and its source. Attitudes were assessed by asking participants opinions, while practice question mainly focused on the recent (up to 1 month) use of contact lenses and their experience. Chi-square test was applied to cross-tabulate gender with knowledge, attitude, and practices of youth towards contact lenses.

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Section: Conclusion Onclusionsmentioning

confidence: 99%

Knowledge and attitude of youth towards contact lenses in Karachi, Pakistan

Irfan¹,

Memon²,

Shaikh³

et al. 2019

Journal of Global Health Reports

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“…The contact lens is one of the competitive candidates for noninvasive continuous physiological glucose monitoring [82][83][84][85][86][87]. A concept using contact lenses to detect glucose in tear fluid was proposed shortly after the study of HCPC sensors [66].…”

Section: Contact Lensmentioning

confidence: 99%

Hydrogel-Based Colloidal Photonic Crystal Devices for Glucose Sensing

Tang

Chen

2020

Polymers

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Diabetes, a common epidemic disease, is increasingly hazardous to human health. Monitoring body glucose concentrations for the prevention and therapy of diabetes has become very important. Hydrogel-based responsive photonic crystal (PC) materials are noninvasive options for glucose detection. This article reviews glucose-sensing materials/devices composed of hydrogels and colloidal photonic crystals (CPCs), including the construction of 2D/3D CPCs and 2D/3D hydrogel-based CPCs (HCPCs). The development and mechanisms of glucose-responsive hydrogels and the achieved technologies of HCPC glucose sensors were also concluded. This review concludes by showing a perspective for the future design of CPC glucose biosensors with functional hydrogels.

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“…27 In the increasingly demanding field of wearable sensors for personalized medicine, contact lens sensors are gaining increasing popularity to provide point-of-care continuous monitoring. 28,29…”

Section: Introductionmentioning

confidence: 99%

Anthocyanin-Functionalized Contact Lens Sensors for Ocular pH Monitoring

et al. 2019

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Anthocyanins are bioactive compounds naturally found in a variety of leaves, fruits, and vegetables. Anthocyanin pigments undergo a modification in their chemical structure when exposed to different concentrations of hydrogen ions, and they were extensively studied to be used as active elements in biocompatible pH sensors. The ocular pH is a significant parameter to assess the ocular physiology in cases of postocular surgery, keratoconjunctivitis, and ocular rosacea. Contact lenses have the potential to be used as medical diagnostic devices for in situ continuous monitoring of the ocular physiology. Here, anthocyanin-functionalized contact lenses were developed as wearable sensors to monitor the ocular pH. Anthocyanin pigments were extracted from Brassica oleracea and used to functionalize the polymeric matrices of commercial soft contact lenses by soaking and drop-casting processes. Contact lenses responded to the physiological ocular pH of 6.5, 7.0, and 7.5, exhibiting a systematic color shift from pink (pH 6.5) to purple (pH 7.0) and blue (pH 7.5). The functionalization of contact lens sensors was evaluated as a function of the dye concentration. Quantitative values were obtained by comparing the RGB triplets of the colors obtained with the naturally extracted dye and with delphinidin chloride dye in 0.0 to 1.5 mmol L–1 aqueous solution. The functionalization of contact lenses was studied as a function of the soaking time, resulting in best results when soaking for 24 h. The dye leakage from the contact lenses in deionized water was evaluated, and a negligible leakage after 18 h was observed. Poly-2-hydroxy ethylmethacrylate contact lenses were fabricated and cross-linked with anthocyanin dye, resulting in a slight color shift upon pH changes from 6.5 to 7.4. Contact lens pH sensors may be used to continuously monitor the ocular pH at point-of-care settings.

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Contact Lens Technology: From Fundamentals to Applications

Cited by 178 publications

References 172 publications

Knowledge and attitude of youth towards contact lenses in Karachi, Pakistan

Knowledge and attitude of youth towards contact lenses in Karachi, Pakistan

Hydrogel-Based Colloidal Photonic Crystal Devices for Glucose Sensing

Anthocyanin-Functionalized Contact Lens Sensors for Ocular pH Monitoring

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