Ocular Chances Associated with Continuous Wear of Contact Lenses

Abstract

This paper is based on clinkai data derived from 35 patients having worn a variety of contact lenses on a continuous wear basis for periods up to two years. Aspects discussed include oedema-induced changes in the ocular parameters, miscellaneous disturbances to corneal integrity end adverse eye reactlonr.Although there has been considerable variation in the corneel swelling response (depending on contact lens gas tranmlssbn, patient age and state of the comes), most patients have shown adaptation within the first one to two weeks. Epithelial microvesicular changes have been observed h a significant number of patients. The adverse eye reactions encountered included corneal ulceration, pannus and acute 'red-eye' reaction.

Effect of 30-Day Continuous Wear of Silicone Hydrogel Contact Lenses on Corneal Thickness

“…According to the authors, corneal sensitivity and endothelial polymegathism could be used as indicators of long-term corneal hypoxia. Zantos et al 23 stated that large (15-50 m) epithelial microcysts sometimes emerge as a late response to hypoxia in contact lens wearers.…”

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

“…The severity of microcysts has been reported to be associated with the duration of wearing low-Dk SCL and with continuous wearing of lenses. 1,2 In the present case, however, daily wear lenses were used for an average of about 12 hr per day. 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.…”

“…Especially, toxic or severe sensitivity reaction to the solution and the solution/silicone-hydrogel lens interaction could be considered, and these possibilities were supported by previous study reported by Jones et al 10 Furthermore, we must consider about the other causes, for example, disorganized cellular growth, necrotic tissue, pockets of cellular debris, apoptosis, and so forth. 1,[11][12][13] With regard to lens care in the present case, it is noteworthy that no lens care solution is recommended by the manufacturer for Acuvue Oasys, so each lens wearers must individually check the compatibility of their lens care solution. In the present case, Medalist Plus had been used previously and should have caused no problems.…”

“…They are formed by degenerated epithelial cells that accumulate in the basal layer of the corneal epithelium. [1][2][3][4] Microcysts are frequently seen in persons who are continuously wearing hydrogel soft contact lenses (SCLs), but are also noted in persons using daily wear of SCLs or even those without contact lenses (CLs) but with much less severity. 5,6 Microcysts may still be observed during the first few weeks of wearing silicone hydrogels if these patients were previously wearing low Dk CLs on an extended wear basis.…”

Anterior segment imaging: New milestones, new challenges

“…In the eye, this error is affected by the viewing angle, the anterior corneal curvature, and the corneal refractive index. Various mathematical approaches to resolving the true positions of the deep surfaces exist 6,7 and are device and software specific. Because of this dependence on first-surface curvature, this purely optical error may also contribute to artifactual posterior corneal surface changes after refractive surgery.…”