Multi-centre evaluation of two daily disposable contact lenses

Walker, Jon; Young, Graeme P.; Hunt, Chris; Henderson, Terri

doi:10.1016/j.clae.2007.02.004

Cited by 34 publications

(18 citation statements)

References 13 publications

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“…However, in many cases, the increased porosity of these materials results in greater protein uptake, due to both protein absorption and adsorption [4,6,7], which may or not have detrimental effects on lens performance. In order to improve comfort, daily wear disposable lenses containing internally locked-in (1 Day Acuvue Moist) or releasable (Focus Dailies with AquaRelease) wetting agents have recently been introduced to the market [8][9][10][11][12][13]. In the case of 1 Day Acuvue Moist, the internal wetting agent is poly(N-vinyl pyrrolidone) (PVP) while it is poly(vinyl alcohol) (PVA) in the Focus Dailies lens materials.…”

Section: Introductionmentioning

confidence: 99%

Hyaluronic acid containing hydrogels for the reduction of protein adsorption

Beek¹,

Jones²,

Sheardown³

2008

Biomaterials

119

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Section: Introductionmentioning

confidence: 99%

Hyaluronic acid containing hydrogels for the reduction of protein adsorption

Beek¹,

Jones²,

Sheardown³

2008

Biomaterials

119

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“…Applications of PVA hydrogels in the biomedical field include contact lenses, wound dressing, coatings for sutures and catheters. [5][6] Several methods have been described for the preparation of PVA-based materials. For instance, high-performance PVA films can be prepared by casting in the presence of a proper plasticizer.…”

Section: Introductionmentioning

confidence: 99%

A Novel Cross‐linked Poly(vinyl alcohol) (PVA) for Vascular Grafts

Chaouat

Visage

Baille

et al. 2008

Adv Funct Materials

173

159

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Poly(vinyl alcohol) (PVA) is a water‐soluble synthetic polymer with excellent film‐forming, emulsifying, and adhesive properties. The aim of this study is to design a simple process for PVA cross‐linking with sodium trimetaphosphate to form membrane devices suitable for biomedical applications. This procedure requires no organic solvent, nor melting process to obtain films with high mechanical strength. Fabrication of a small diameter tube from a PVA film is easy with a single wrapping step around a Teflon rod. Dynamic mechanical analysis demonstrated that, upon removal of the applied stress, the PVA film with a Young's modulus of 2 × 105 kPa returns to its original size and shape. The wall thickness of PVA tubes is 344 ± 13 µm (n = 12), which is close to the wall thickness of a human artery (350–710 µm). Suture retention of a PVA tube is excellent (140 ± 11 g), close to that of human vessels. The burst pressure of PVA tubes is found to be 507 ± 25 mm Hg, more than three times higher than the human healthy systolic arterial pressure. Under arterial pressure, there was no leakage even after needle puncture, contrary to clinical vascular expanded polytetrafluoroethylene prostheses. Finally, PVA tubes of 2 mm in diameter are used to replace a segment of an infrarenal aorta in rats. For at least one week, no mechanical nor thrombotic complications are noticed even in the absence of anticoagulant or antiplatelet treatment. Graft patency is also evidenced with non‐invasive imaging techniques. As a conclusion, this novel cross‐linking method confers to poly(vinyl alcohol) particular mechanical properties such as compliance, elasticity and resistance to mechanical stress, compatible with the circulatory blood flow.

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“…As there is a lack of data regarding wearing time in children, comparisons can be drawn only from adults. The average contact lens‐wearing time for the ACHIEVE subjects is within the reported range for adults, which falls between 11 and 14 hours per day 10–13 . Currently corneal refractive therapy is the only modality available that ensures full‐day correction without the use of a corrective device 8,9 …”

Section: Discussionmentioning

confidence: 77%

A comparison of spectacle and contact lens wearing times in the ACHIEVE study

Jones‐Jordan

Chitkara²,

Coffey

et al. 2010

Clinical and Experimental Optometry

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Purpose:The aim was to compare vision correction wearing time between myopic children and teenagers in a clinical trial of contact lenses and spectacles. Methods: Parents of subjects in the Adolescent and Child Health Initiative for Vision Empowerment (ACHIEVE) study provided wearing times for spectacle and contact lens wear. Hours wearing primary correction and total correction were compared between the two treatment groups. Other factors hypothesised to be associated with wearing time were analysed. Results: The average wearing time of the primary correction differed significantly with the wearing time for the spectacles group being 91.5 hours per week compared to 80.3 hours per week for the contact lens wearers (p < 0.0001). Total correction time was slightly higher for the contact lens wearers, 97.5 hours per week, after accounting for time wearing spectacles. Higher refractive error was strongly related to longer wearing times (p < 0.0002). Age and treatment group were associated with wearing time (p = 0.005). Young contact lens wearers wore their lenses less than young spectacle wearers and older contact lens wearers. Low scores on an appearance quality-of-life scale were associated with longer wearing time in spectacle wearers compared to the low-and high-scoring contact lens wearers. Gender, spectacle satisfaction and activities were not related to wearing time. Conclusions: While contact lens wearers, on average, wear their contact lenses less than spectacle wearers, they spend roughly the same amount of time wearing a refractive correction. Higher refractive error resulted in longer wearing times for both spectacle and contact lens wearers. Younger contact lens wearers wore their contact lenses for shorter periods than the spectacle wearers, but still wore them, on average, 74.4 hours per week (about 10 hours per day), suggesting that contact lenses are a viable alternative mode of correction for children.

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Multi-centre evaluation of two daily disposable contact lenses

Cited by 34 publications

References 13 publications

Hyaluronic acid containing hydrogels for the reduction of protein adsorption

Hyaluronic acid containing hydrogels for the reduction of protein adsorption

A Novel Cross‐linked Poly(vinyl alcohol) (PVA) for Vascular Grafts

A comparison of spectacle and contact lens wearing times in the ACHIEVE study

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