Influence of soft contact lens material on corneal warpage: prevalence and time to resolution

Rayess, Youssef A; Arej, Nicolas; Massih, Youssef Abdel; Antoun, Joëlle; Waked, N.

doi:10.1016/j.jcjo.2017.09.003

Cited by 16 publications

(9 citation statements)

References 12 publications

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“…3 Extended contact lens wear is associated with risks including infection and reversible or permanent changes in anterior corneal surface geometry. 16,17,22,23,24,25,26,27 A Placido/Scheimpflug instrument was used to evaluate anterior corneal curvature and corneal wavefront maps. It provides measurements with good to excellent repeatability.…”

Section: Discussionmentioning

confidence: 99%

“…20,21 Although these FDA guidelines were developed some years ago, very little has been reported on the effects of SiH lens wear on the anterior corneal surface. While reversible alterations in the geometry of the corneal anterior surface are commonly observed in SCL wearers, 16,17,22,23,24,25,26,27 no study has measured the impact of SiH lens wear on zonal epithelial variations and corneal wavefront aberrations. Moreover, the influence of positiveand negative powered SiH lenses on corneal shape has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Shape of the anterior surface of the cornea after extended wear of silicone hydrogel soft contact lenses

Stachura

Mlyniuk

Bloch

et al. 2021

Ophthalmic Physiologic Optic

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Purpose: To measure geometrical changes in the anterior surface of the cornea after wearing silicon hydrogel (SiH) soft contact lenses continuously for 1 week. Methods: Forty-three eyes with 3.0D of myopia and 22 eyes with 3.0D of hyperopia were enrolled in the prospective, interventional study. All subjects underwent a general eye examination, corneal tomography with wavefront aberration analysis, corneal thickness measurements and epithelial thickness mapping before and after wearing SiH lenses (Acuvue Oasys) for 7 days. Results: No significant changes in average keratometry were observed in either refractive group. In the myopic group, keratometry findings for the flat meridian (K1) and central corneal thickness decreased significantly. After +3.0 D lens wear in the hyperopic group, a significant decrease in epithelial thickness up to 3.19 µm was observed in the central and paracentral cornea, (p < 0.001). In both refractive groups, the largest epithelial thickness increase was seen in the periphery. A decrease in spherical aberration was noted in myopic eyes, while an increase of both higher order corneal aberrations and coma was found in hyperopic subjects. Conclusion: Extended wear of SiH lenses results in a significant change in epithelial thickness leading to alteration in the geometry of the anterior surface of the cornea, particularly in hyperopic patients. These epithelial thickness variations lead to changes in the higher order aberrations of the cornea.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shape of the anterior surface of the cornea after extended wear of silicone hydrogel soft contact lenses

Stachura

Mlyniuk

Bloch

et al. 2021

Ophthalmic Physiologic Optic

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“…Upon cessation of wear, corneal topography returned to normal in most wearers with rigid corneal lenses necessitating a longer rehabilitation period [123]. Corneal flattening has been also been reported with SiHy contact lenses [147] as well as with short term scleral lens wear in keratoconic patients, irrespective of patient history of corneal cross-linking [125]. Warpage associated with hypoxia is described in Section 4.7.…”

Section: Corneal Warpagementioning

confidence: 95%

“…More subtle changes detectable only with computer-assisted topographic analysis have also been observed in asymptomatic rigid corneal and hydrogel contact lens wearers [122,123]. Given that contact lens-induced corneal warpage has also been reported with SiHy contact lenses, hypoxia may not be the only predisposing cause [147].…”

Section: Corneal Warpage and Changes In Refractive Errormentioning

confidence: 96%

“…Change in corneal contour rigid corneal [123], conventional hydrogel [123], SiHy [147], scleral [125] Refit: modify fitting relationship for rigid corneal CLs or, refit to soft CLs or, change material modulus unknown. The first line of treatment is to eliminate hypoxia by refitting contact lenses or reducing wear time [150] and with treatment, new vessels regress to barely visible 'ghost vessels'.…”

Section: Corneal Warpagementioning

confidence: 99%

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BCLA CLEAR - Contact lens complications

Stapleton

Bakkar

Carnt

et al. 2021

Contact Lens and Anterior Eye

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Contact lens-related complications are common, affecting around one third of wearers, although most are mild and easily managed. Contact lenses have well-defined anatomical and physiological effects on the ocular surface and can result in other consequences due to the presence of a biologically active material. A contact lens interacts with the tear film, ocular surface, skin, endogenous and environmental microorganisms, components of care solutions and other antigens which may result in disease specific to contact lens wear, such as metabolic or hypersensitivity disorders. Contact lens wear may also modify the epidemiology or pathophysiology of recognised conditions, such as papillary conjunctivitis or microbial keratitis. Wearers may also present with intercurrent disease, meaning concomitant or pre-existing conditions unrelated to contact lens wear, such as allergic eye disease or blepharitis, which may complicate the diagnosis and management of contact lens-related disease.Complications can be grouped into corneal infection (microbial keratitis), corneal inflammation (sterile keratitis), metabolic conditions (epithelial: microcysts, vacuoles, bullae, tight lens syndrome, epithelial oedema; stromal: superficial and deep neovascularisation, stromal oedema [striae/folds], endothelial: blebs, polymegethism/ pleomorphism), mechanical (corneal abrasion, corneal erosion, lens binding, warpage/refractive error changes; superior epithelial arcuate lesion, mucin balls, conjunctival epithelial flaps, ptosis, discomfort), toxic and allergic disorders (papillary conjunctivitis, solution-induced corneal staining, incomplete neutralisation of peroxide, Limbal Stem Cell Deficiency), tear resurfacing disorders/dry eye (contact lens-induced dry eye, Meibomian gland dysfunction, lid wiper epitheliopathy, lid parallel conjunctival folds, inferior closure stain, 3 and 9 o'clock stain, dellen, dimple veil) or contact lens discomfort. This report summarises the best available evidence for the classification, epidemiology, pathophysiology, management and prevention of contact lensrelated complications in addition to presenting strategies for optimising contact lens wear.

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