scholarly journals Characterization of surface roughness of new nanophotonic soft contact lenses using lacunarity and AFM method

2018 ◽  
Vol 72 (3) ◽  
pp. 157-166 ◽  
Author(s):  
Aleksandra Mitrovic ◽  
Bozica Bojovic ◽  
Dragomir Stamenkovic ◽  
Dejana Popovic
Keyword(s):  
Surface Roughness ◽  
Surface Characterization ◽  
Contact Lenses ◽  
Tear Film ◽  
Basic Material ◽  
Machining Processes ◽  
Soft Contact ◽  
Average Roughness ◽  
Soft Contact Lenses

The aim of this study was to develop new soft contact lens (SCL) materials which would, after recommended and existing machining processes, improve surface roughness. Nanomaterials (fullerene, fullerol and methformin hydroxylate fullerene) were incorporated into commercial material for SCL (SL38) based on PHEMA, which were derived by the technology in the production lab of the company Soleko (Milan, Italy). Nanophotonic SCLs (SL38-A, SL38-B, SL38-C, respectively) were produced in the company Optix (Belgrade, Serbia) from the obtained materials. For the surface characterization of SCLs, AFM analysis and lacunarity method were performed. The results showed that for the SL38-B average roughness value is lower than those of SL38-A and SL38. The topography parameters of SL38-C were between the parameters of SL38-A and SL38-B. Lacunarity analysis of AFM images confirmed that SCLs surface state should belong to either group of adequate (slanted p-diagram) or inadequate (contorted p-diagram) roughness concerning tear film stability. Nanophotonic SCL SL38-C exibits more acceptable performance considering SCL surface functional behavior as compared to other SCLs. The positive result of incorporating nanomaterials into basic material for SCL is better quality of the nanophotonic SCLs surfaces. On the bases of these experiments, the assumption that incorporation of fullerene derivate will not increase surface roughness parameters is confirmed.

Tear film proteins attached to soft contact lenses

2012 ◽  
Vol 90 ◽  
pp. 0-0
Author(s):  
K NIELSEN ◽  
H VORUM ◽  
N EHLERS ◽  
J HJORTDAL ◽  
B HONORé
Keyword(s):  
Contact Lenses ◽  
Tear Film ◽  
Soft Contact ◽  
Soft Contact Lenses

Presbyopia correction using multifocal contact lenses (through the example of Biofinity Multifocal)

The Eye ◽  
2020 ◽  
Vol 22 (129) ◽  
pp. 51-57
Author(s):  
Olga Kolchenko
Keyword(s):  
Contact Lenses ◽  
Tear Film ◽  
Population Ageing ◽  
Medicine Use ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Vision Correction ◽  
Reading Glasses ◽  
Presbyopia Correction

Proper presbyopia correction has become increasingly relevant for clinical practice in recent years. This problem arises from both the population ageing as a whole and the need for a higher vision quality that directly affects the quality of patients’ life. There are many factors that require comfortable and high-quality vision correction with soft contact lenses, such as active sports, the desire not to change usual activities and feel younger, the reluctance to use extra reading glasses and glasses in general. We have to look for soft contact lenses with the wettest surface, lenses that can maintain tear film for as long as possible due to following reasons: disruption of eye surface’s wetting; dry eye syndrome, that sometimes arise with age; medicine use, one of the side effects of which is usually the reduction of tear production. The review provides recommendations for the fitting of multifocal contact lenses through the example of Biofinity Multifocal with different designs: distance-center and near-center. Conclusion: It is possible not only to achieve high vision quality at all distances in patients, but also to maintain their accustomed lifestyle and to minimize their astenopic complaints with the help of proper presbyopia correction.

Tear Film Dynamics on Soft Contact Lenses

2014 ◽  
Vol 91 (12) ◽  
pp. 1406-1411 ◽  
Author(s):  
Dorota H. Szczesna-Iskander ◽  
D. Robert Iskander
Keyword(s):  
Contact Lenses ◽  
Tear Film ◽  
Soft Contact ◽  
Soft Contact Lenses

scholarly journals Tear Film Surface Quality with Soft Contact Lenses Using Dynamic Videokeratoscopy

2008 ◽  
Vol 1 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Miriam Kopf ◽  
Fan Yi ◽  
D. Robert Iskander ◽  
Michael J. Collins ◽  
Alyra J. Shaw ◽  
...  
Keyword(s):  
Surface Quality ◽  
Contact Lenses ◽  
Tear Film ◽  
Film Surface ◽  
Soft Contact ◽  
Soft Contact Lenses
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