Article
Ophthalmology
O. Ashton Morgan, Aftab A. Mirza, Ketan R. Parmar, Andrew J. Plowright, Jose A. Vega, Gary N. Orsborn, Carole Maldonado-Codina, John C. Whitehead, Philip B. Morgan
Summary: The purpose of this study was to compare the clinical performance and willingness to pay for toric versus spherical soft contact lenses in astigmatic individuals. The results indicated that the toric lens outperformed the spherical lens in terms of visual acuity, particularly for distance tasks. However, there were no significant differences in comfort scores. Both the clinical subjects and online respondents expressed a willingness to pay an additional fee for toric lenses, with the estimated premium ranging between 13 and 16 pounds per month.
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Ophthalmology
Sarah Guthrie, Alison Ng, Jill Woods, Jose Vega, Gary Orsborn, Lyndon Jones
Summary: This study found that lens handling, comfort, and vision have a significant impact on overall satisfaction with single vision contact lenses. The correlation between satisfaction with lens handling and overall satisfaction varied depending on the lens material. The correlation between handling for lens application and overall satisfaction was similar to that of vision, emphasizing the importance of lens application in determining overall patient satisfaction.
CONTACT LENS & ANTERIOR EYE
(2022)
Article
Ophthalmology
Carlos Carpena-Torres, Cristina Pastrana, Candela Rodriguez-Pomar, Maria Serramito, Gonzalo Carracedo
Summary: This study aims to evaluate the comfort, visual function, and in vivo wettability after inserting hydrogel and silicone hydrogel contact lenses, as well as to determine the appropriate time for evaluating these parameters. The results showed that comfort, high-contrast visual acuity, and contrast sensitivity significantly improved over time, while in vivo wettability declined. Except for comfort and contrast sensitivity, all the parameters stabilized within 10 minutes after inserting the contact lenses. Additionally, there were differences in in vivo wettability and visual acuity between hydrogel and silicone hydrogel contact lenses.
CONTACT LENS & ANTERIOR EYE
(2022)
Article
Chemistry, Physical
V. Chandran Suja, A. Verma, E. J. L. Mossige, K. W. Cui, V. Xia, Y. Zhang, D. Sinha, S. Joslin, G. G. Fuller
Summary: By studying the mechanisms of wetting agents on tear film stability, we found that zwitterionic wetting agents can effectively stabilize the tear film, and adjusting the surface concentration and mixture ratio of wetting agents can enhance their wetting characteristics. Furthermore, we confirmed the significance of minimizing the contact angle and contact angle hysteresis for wetting performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ahmad H. Shihab, Ashkan Eliasy, Bernardo T. Lopes, Richard Wu, Lynn White, Steve Jones, Brendan Geraghty, Akram Joda, Ahmed Elsheikh, Ahmed Abass
Summary: The study found that all tested soft contact lens materials exhibited nonlinear behavior under compression loading, showing noticeable changes in stress-strain behavior. The compression modulus of elasticity was on average 2.2 times higher than the tensile modulus of elasticity, and it is recommended to use nonlinear compression-based material models when investigating lens-handling off-eye.
Article
Ophthalmology
Carole Maldonado-Codina, Maria Navascues Cornago, Michael L. Read, Andrew J. Plowright, Jose Vega, Gary N. Orsborn, Philip B. Morgan
Summary: This study found an association between subjective comfort and subjective vision quality, phase of wear, and lens type when wearing contemporary daily disposable soft toric contact lenses. Higher subjective vision quality was linked to greater comfort scores. Additionally, discomfort symptoms may be more intense if there is perceived visual compromise in daily disposable soft toric lenses.
CONTACT LENS & ANTERIOR EYE
(2021)
Article
Materials Science, Multidisciplinary
Mohamed Elsherif, Ahmed E. Salih, Ali K. Yetisen, Haider Butt
Summary: This study developed new contact lenses that assist color-blind individuals by immobilizing two specific dyes to block undesired light and enhance color visibility. The proposed contact lenses showed better outcomes in improving color vision performance compared to commercial color-blind glasses.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Multidisciplinary Sciences
Patryk Mlyniuk, Joanna Stachura, Alfonso Jimenez-Villar, Ireneusz Grulkowski, Bartlomiej J. Kaluzny
Summary: This study used SS-OCT to investigate the shape alterations of daily disposable SCLs after wear. The results showed a decrease in anterior curvature for all three types of lenses, with a moderate correlation with corneal keratometry. However, the changes in other geometrical parameters were lens-specific.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Applied
Qiang Zhu, Qiao Zhang, Ding-Yi Fu, Gaoxing Su
Summary: With the increasing number of applications, there is a growing demand for comfort in contact lenses. Adding polysaccharides to lenses is a popular method to enhance comfort for wearers, but it may compromise some lens properties. This review comprehensively examines the impact of polysaccharide addition on various lens wear parameters and discusses the factors that modulate these effects. It also highlights the potential of polysaccharide-based contact lenses as a promising option for biodegradable lenses.
CARBOHYDRATE POLYMERS
(2023)
Article
Ophthalmology
Katrina L. Schmid, Kate L. Gifford, David A. Atchison
Summary: This study evaluated the effects of multifocal soft contact lenses on visual quality, accommodation, and vergence in young adult myopes. The results showed that the two aspheric designs had a greater impact on visual acuity, contrast sensitivity, and accommodation response compared to the concentric design.
CONTACT LENS & ANTERIOR EYE
(2023)
Review
Biochemistry & Molecular Biology
Iwona Rykowska, Iwona Nowak, Rafal Nowak
Summary: Contact lenses serve as an innovative drug delivery system in treating eye diseases, reducing drug loss and extending the duration of efficacy. Studies have shown that contact lenses can significantly improve the penetration of topical therapeutic agents for eye treatments.
Article
Engineering, Biomedical
L. Vilhena, A. Ramalho
Summary: This research aims to evaluate the impact of aging on the friction of contact lenses (CL) and identify the material modifications that may cause variations in the friction coefficient post-aging. A simulated aging process was conducted to replicate the effects of transition between closed and open eyes and exposure to environmental aggressions, such as ultraviolet radiation, which are the main factors influencing CL material surface. The friction and stiffness of the CL were characterized before and after the aging process, showing an increase in both parameters for all types of contact lenses. Hydrogel lenses were least affected by aging, while silicone-hydrogel lenses based on delefilcon A exhibited the least stability of properties.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Ophthalmology
Alex C. H. Ong, Fiona E. Cruickshank, Amy L. Sheppard, Leon N. Davies
Summary: The study aimed to evaluate the efficacy of multifocal soft contact lenses in reducing asthenopic symptoms in myopes with accommodative lag. The results showed that wearing multifocal contact lenses can improve the severity of asthenopic symptoms, and this improvement appears to be unrelated to a reduction in accommodative lag but may be related to changes in near heterophoria.
CONTACT LENS & ANTERIOR EYE
(2022)
Article
Chemistry, Multidisciplinary
Ye Tian, Hanchuan Tang, Tianyu Kang, Xinyi Guo, Jiaxin Wang, Jianfeng Zang
Summary: This study presents an inverse-designed approach for the precise correction of color vision deficiency (CVD). By measuring the wavelength shift of a patient's abnormal cone photoreceptors, customized aid lenses were designed and fabricated using silica-coated gold nanoparticles with appropriate sizes and concentrations. The simulated color vision and human tests verified the effectiveness of the inverse-designed aid lenses in precise color filtering and customized CVD management.
Article
Polymer Science
Christopher Musgrave, Lorcan O'Toole, Tianyu Mao, Qing Li, Min Lai, Fengzhou Fang
Summary: This study provides experimental evidence of the reliability and reusability of cyclic olefin copolymer (COC) moulds in the manufacturing of soft contact lenses. These moulds maintained high performance surface roughness characteristics even after repeated use and exposure to high intensity ultraviolet (UV) light. Comparison with commercial lenses showed that the surface roughness of lenses made using COC moulds remained almost unchanged.
