Tear exchange and contact lenses: A review

Müntz, Alex; Subbaraman, Lakshman N.; Sorbara, Luigina; Jones, Lyndon

doi:10.1016/j.optom.2014.12.001

Cited by 67 publications

(60 citation statements)

References 108 publications

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“…Minimum improvement in visual acuity (20%) and fair relief from symptoms and signs (60%) were noted 9 . The frequency of instillation of artificial tear drops was also found to be decreased.…”

Section: Discussionmentioning

confidence: 99%

Therapeutic uses of Soft Contact Lenses

Bajaj¹,

Singh²

2016

jmscr

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Soft contact lenses are widely used for correction of refractive errors and in diseases related to corneal surface irregularities. In this case series we have used soft contact lenses in treatment of patients having bullous keratopathy, corneal ulcer, dry eye, trichiasis and corneal perforation. Soft contact lenses were found to be superior than conventional method of treatment and they have revolutionized the management of corneal diseases. Visual improvement was found to be satisfactory in all cases along with definite improvement of symptoms in cases of corneal surface irregularities.

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Section: Discussionmentioning

confidence: 99%

Therapeutic uses of Soft Contact Lenses

Bajaj¹,

Singh²

2016

jmscr

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“…8 A poor postlens tear exchange, especially with soft contact lenses, leads to the buildup of inflammatory cells, metabolic byproducts, and debris in the postlens tear film that may cause adverse ocular responses. 9,10,14 Supporting this theory is the fact that gas-permeable lenses demonstrate high levels of tear mixing similar to physiologic tear turnover 17 as well as fewer serious ocular complications commonly seen with soft lens extended wear. 2 The apparent difference between rigid and soft lenses, linked to variations in size and material properties, lies in their dissimilar capabilities to mix and replenish the postlens tear film.…”

Section: Adverse Events During Contact Lens Wearmentioning

confidence: 96%

“…7,9,10 Specifically, some components of lens care solutions significantly alter dynamic interfacial properties and rheological behavior of human tear lipid films. [11][12][13] Clinical results suggest that both Asian and non-Asian groups exhibited increased corneal staining in response to biguanidepreserved solutions, although Asian subjects demonstrated greater sensitivity to the solutions than did non-Asian subjects.…”

Section: Adverse Events During Contact Lens Wearmentioning

confidence: 99%

Accounting for Ethnicity-Related Differences in Ocular Surface Integrity as a Step Toward Understanding Contact Lens Discomfort

Chan

Svitova

Lin³

2017

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

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Contact lens discomfort is a common problem that can lead to unsuccessful or limited contact lens wear. Although many factors may contribute to contact lens discomfort, limited research has explored the influence of ethnicity-related differences in the anatomy and physiology of the ocular surface. Therefore, we performed a search of the literature in PubMed using key words related to “ocular surface” paired with the terms “race” and “ethnicity.” The goal of this review was to determine potential areas of research regarding ethnicity differences, particularly between Asian and non-Asian eyes, in ocular surface integrity to advance our understanding of contact lens discomfort.

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“…Additionally, if parameter p is plotted for every section made by slicing the surface AFM image, then the diagram shown in Figure 1 (right) can be considered as the AFM image lacunarity signature. The plots shown in Figure 1 have been made according to Equation (6):…”

Section: Lacunarity Analysismentioning

confidence: 99%

“…The importance of tear exchange behind an RGP contact lens remains an ongoing debate. 6 Once a contact lens is inserted, the value of the precorneal tear film thickness doubles, resulting in a 2-5 μm thickness for pre and post lens tear films. Some authors 7 determined the post lens tear film below 3 μm.…”

Section: Introductionmentioning

confidence: 99%

Lacunarity properties of nanophotonic materials based on poly(methyl methacrylate) for contact lenses

Tomić¹,

Bojović²,

Stamenković³

et al. 2017

Mater. Tehnol.

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The aim was to develop new materials that would, after appropriate machining processes, improve the surface roughness and wettability of contact lenses. The samples used in this investigation were standard rigid gas-permeable (RGP) SOLEKO contact lenses, made of poly-MMA-co-siloxy silane methacrylate material (known under the commercial name SP40 TM ), and its modifications by adding three nanomaterials: fullerene C60 (designated as SP40-A), fullerol C60(OH)24 (designated as SP40-B) and methformin hydroxylate fullerene C60(OH)12(OC4N5H10)12 (designated as SP40-C). Both atomic force microscopy (AFM) and magnetic force microscopy (MFM) were used to measure the topography and gradient of the magnetic field of the nanophotonic materials and the reference samples. According to the magnetic properties of all the materials yielded by MFM it can be concluded that adding fullerene and its derivatives certainly reduces the spectrum of the phase shifts angle by almost 50 %, which increases the paramagnetic characteristics of the nanophotonic material. The positive result of nanophotonic materials characterization is the fact that the roughness parameter values for all of these materials, are lower than those for the basic material. A surface lacunarity analysis, based on in-house procedures for determining the lacunarity value of contact lens surfaces, confirms the influence of surface topology on the tear film volume distribution and, consequently, the contact lens' surface lubrication. The presence of carbon nanomaterials, according to the surface roughness parameters, are improved for rigid gas-permeable (RGP) contact lenses made from nanophotonic polymer materials compared to those produced from the basic material. Keywords: fullerenes, polymer materials, surface roughness, atomic force microscopy, magnetic force microscopy Namen je bil razviti nov material, ki bi po ustrezni strojni obdelavi zmanj{al hrapavost povr{ine in omo~ljivost kontaktnih le~. Vzorci, uporabljeni v tej raziskavi so bile standardne toge, za plin prepustne (RGP) SOLEKO kontaktne le~e, narejene iz poli-MMA-ko-siloksi silan metakrilatnega materiala (s komercialnim imenom poznanega SP40 TM ) in njihove modifikacije z dodatkom treh nanomaterialov: fulerena C60 (ozna~enega kot SP40-A), fulerola C60(OH)24 (ozna~enega z SP40-B) in metformin hidroksilat fulerena C60(OH)12(OC4N5H10)12 (ozna~enega z SP40-C). Uporabljeni so bili: mikroskopija na atomsko silo (AFM), mikroskopija na magnetno silo (MFM) za merjenje topografije in gradient magnetnega polja nanofotonskih materialov in referen~nih vzorcev. Skladno z magnetnimi lastnostmi vseh materialov, dobljenih z MFM, je mogo~e zaklju~iti, da dodajanje fulerenov in njegovih izpeljank, mo~no zmanj{a spekter kotov faznega premika za skoraj 50 %, kar pove~a paramagnetne zna~ilnosti nanofotonskih materialov. Pozitivni rezultati karakterizacije nanofotonskih materialov so, da so vrednosti parametra hrapavosti pri vseh teh materialih ni`je kot pri osnovnem materialu. Analiza povr{inske razporeditve praznin, na osnovi...

show abstract

Tear exchange and contact lenses: A review

Cited by 67 publications

References 108 publications

Therapeutic uses of Soft Contact Lenses

Therapeutic uses of Soft Contact Lenses

Accounting for Ethnicity-Related Differences in Ocular Surface Integrity as a Step Toward Understanding Contact Lens Discomfort

Lacunarity properties of nanophotonic materials based on poly(methyl methacrylate) for contact lenses

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