Proposed performance criteria for extended wear contact lenses

Brennan, Noel A.; Coles, M.-L. Chantal

doi:10.1016/s1367-0484(00)80007-7

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…There have been no previous reports about the occurrence of so many microcysts in a person using high-Dk silicone hydrogel lenses on a daily basis. Brennan et al 7 and Keay et al 8 reported that the number of microcysts decreased when patients using low-Dk SCLs were switched to high-Dk silicone hydrogel lenses. According to their reports, about half of the patients showed an initial increase in the number of microcysts for 1 week after lens switching, but the number then began to decrease and returned to baseline after 1 month.…”

Section: Eye and Contact Lens • Volume 35 Number 3 May 2009mentioning

confidence: 99%

“…There have been no reports of microcysts in persons using highDk/t silicone hydrogel CLs, so some investigators have suggested from this that microcysts may be caused by hypoxia. [5][6][7][8] We recently encountered a female who used daily high-Dk silicone hydrogel lenses and had comparatively severe microcysts accompanied by reduced visual acuity. These microcysts were observed with a confocal microscope and their characteristics were determined, as reported here.…”

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confidence: 99%

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An Atypical Case of Microcysts Associated With Silicone Hydrogel Contact Lens: Findings on In Vivo Confocal Laser Microscopy

Toshida

Murakami

2009

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Section: Eye and Contact Lens • Volume 35 Number 3 May 2009mentioning

confidence: 99%

mentioning

confidence: 99%

An Atypical Case of Microcysts Associated With Silicone Hydrogel Contact Lens: Findings on In Vivo Confocal Laser Microscopy

Toshida

Murakami

2009

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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“…Сьогодні контактна лінза -це високотехнологічний біосумісний виріб, здатний утримувати вологу і пропускати кисень до рогівки, у такий спосіб запобігаючи ускладненням. Але контактні лінзи є медичним виробом, і їх носіння пов'язане з деякими ризиками [3,11,14,29]. Так, за даними Ph.B.…”

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Ускладнення Контактної Корекції

Bezditko

2024

AOU

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Контактні лінзи стають все більш популярними. Сьогодні контактна лінза — це високотехнологічний біосумісний виріб, здатний утримувати вологу і пропускати кисень до рогівки, у такий спосіб запобігаючи ускладненням. Але контактні лінзи є медичним виробом, і їх носіння пов’язане з деякими ризиками. У роботі розкриті деякі механізми виникнення ускладнень контактної корекції, наведені класифікації загальних та метаболічних ускладнень. Описані ускладнення епітеліального, стромального та ендотеліального шарів рогівки. Подані характеристики інфекційних та алергічних ускладнень поверхні ока. Описані варіанти механічних пошкоджень поверхні ока контактними лінзами. Надані рекомендації з лікування та профілактики ускладнень контактної корекції.

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Is there a question of safety with continuous wear?

Brennan¹

2002

Clinical and Experimental Optometry

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The availability of silicone-containing hydrogel contact lenses (SCHCLs) has refocused attention on the risks associated with continuous wear (CW). The major barrier to optometrists prescribing CW in Western societies is a perceived danger of microbial keratitis (MK). This perception has been shaped largely by educators who have developed their opinions from case reports in the ophthalmic literature, sensationalist lay press reports and later epidemiological studies and from prominent physicians in tertiary referral centres, following an increased incidence of MK with extended wear (EW) of traditional hydrogel materials. The basis for the perceived lack of safety is the higher risk of MK with EW compared to daily wear and incidence figures that suggest an unacceptable level of MK in a population at risk, albeit a small risk on an individual basis. In this paper, I re-evaluate the validity of the previous data and challenge the conclusions regarding the nature of the risk with traditional hydrogel lens materials. Areas under scrutiny include diagnostic criteria, morbidity caused by different micro-organisms, potential bias in studies and reports, analysis of visual outcomes and cost to the community, and improvements over time in the understanding and handling of contact lens-related complications. Significant loss of vision with EW appears to be less frequent than is the common perception. When the risks are placed in the perspective of other data such as that for refractive surgery, the arguments against EW do not seem so compelling. The high oxygen transmissibility of SCHCLs may enable safe CW but a large-scale epidemiological study is needed to allay remaining doubts. Any such future studies should note the points outlined in this document.

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Proposed performance criteria for extended wear contact lenses

Cited by 4 publications

References 5 publications

An Atypical Case of Microcysts Associated With Silicone Hydrogel Contact Lens: Findings on In Vivo Confocal Laser Microscopy

An Atypical Case of Microcysts Associated With Silicone Hydrogel Contact Lens: Findings on In Vivo Confocal Laser Microscopy

Ускладнення Контактної Корекції

Is there a question of safety with continuous wear?

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