scholarly journals Hybrid contact lenses for the correction of primary and induced ametropias

2020 ◽  
Vol 13 (1) ◽  
pp. 102-107 ◽  
Author(s):  
V. V. Neroev ◽  
A. V. Myagkov ◽  
O. V. Guryanova ◽  
A. T. Khandzhyan ◽  
A. I. Yakunina
Keyword(s):  
Contact Lenses ◽  
Modern Method ◽  
Permeable Material ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Quality Of Vision ◽  
Corneal Lens ◽  
Hydrophilic Material ◽  
Optical Zone

The review presents the data on the use of hybrid contact lenses (HCL), a modern method of contact correction of ametropias of diverse origins. A HCL has a central rigid optical zone made of highly gas-permeable material and a flexible peripheral part made of hydrophilic material. These lenses combine the optical effect of gas-permeable corneal lens with the comfort and stable fitting of soft contact lenses. Compared with the corneal (RGP) lenses, HCLs are more comfortable, often are better centrated and more stably fit on the eye. HCLs are successfully used in various refractive disorders: ametropias (with regular cornea), irregular astigmatism, presbyopia, including that combined with astigmatism. This type of lens is a good option of contact correction for patients who have high requirements to the quality of vision.

scholarly journals Experience in application of hybrid contact lenses for astigmatism correction

The Eye ◽  
2019 ◽  
Vol 127 (2019-3) ◽  
pp. 22-26
Author(s):  
Anush Khandjyan ◽  
Alexander Myagkov ◽  
Olga Guryanova ◽  
Olga Petrova
Keyword(s):  
Contact Lenses ◽  
Good Alternative ◽  
Permeable Material ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Astigmatism Correction ◽  
Optical Part ◽  
Quality Of Vision ◽  
Hydrophilic Material

The review covers the issue of hybrid contact lenses application as one of the modern contact correction methods in patients with ametropias of various genesis. Hybrid contact lenses consist of a rigid central optical part made of highly gas-permeable material and a flexible peripheral part made of hydrophilic material. These lenses combine the optical correction qualities of gas-permeable corneal lenses with the comfort and stable fit usually provided by soft contact lenses. Compared to gas-permeable corneal lenses, hybrid lenses are more comfortable; often have better centration and more stable fit on the eye. Hybrid contact lenses successfully correct both types of astigmatism: regular and irregular. This type of lenses is a good alternative method of contact correction for patients who place heavy demands in terms of the quality of vision.

scholarly journals STUDY OF THE OPTICAL POWER OF NANOPHOTONIC SOFT CONTACT LENSES BASED ON POLY (2- HYDROXYETHYL METHACRYLATE) AND FULLERENE

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Aleksandra Debeljković Mitrović ◽  
Dragomir Stamenković ◽  
Manuel Conte ◽  
Božica Bojović ◽  
Spomenko Mihajlović
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Measurement Techniques ◽  
Optical Power ◽  
Soft Contact ◽  
Standard Material ◽  
Soft Contact Lenses ◽  
Soft Contact Lens ◽  
Power Cylinder

In this paper results of comparative study of the optical power of soft contact lenses (SCL) made of standard material for SCL and nanophotonic materials with different measurement techniques used for the final contact lens controllers are presented. Three types of nanophotonic soft contact lenses were made of standard polymacon material (Soleko SP38TM) incorporated with fullerene C60, fullerol C60(OH)24 and fullerene metformin hydroxylate C60(OH)12(OC4N5H10)12. For the purposes of material characterization for potential application as soft contact lenses, the optical properties of the soft contact lenses were measured by Rotlex and Nidek device. With Rotlex device the following optical results were obtained: optical power and map of defects, while with the Nidek device: optical power, cylinder power and cylinder axis. The obtained values of optical power and map of defects showed that the optical power of synthesized nanophotonic soft contact lens is same to the nominal value, while this was not the case for the standard soft contact lens. Also, the quality of the nanophotonic soft contact lens is better than the standard one. Hence, it is possible to synthesize new nanophotonic soft contact lenses of desired optical characteristics, implying possibilities for their application in this field.

scholarly journals Nonsurgical Procedures for Keratoconus Management

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
L. Rico-Del-Viejo ◽  
M. Garcia-Montero ◽  
J. L. Hernández-Verdejo ◽  
S. García-Lázaro ◽  
F. J. Gómez-Sanz ◽  
...  
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Good Alternative ◽  
Lens System ◽  
Soft Contact ◽  
Visual Outcomes ◽  
Soft Contact Lenses ◽  
The Past ◽  
Contact Lens Fitting

Objectives. To describe the past 20 years’ correction modalities for keratoconus and their visual outcomes and possible complications.Methods. A review of the published literature related to the visual outcomes and possible complications in the context of keratoconus management using nonsurgical procedures for the last 20 years (glasses and contact lenses) was performed. Original articles that reported the outcome of any correction modalities of keratoconus management were reviewed.Results. The most nonsurgical procedure used on keratoconus management is the contact lens fitting. Soft contact lenses and soft toric contact lenses, rigid gas-permeable contact lenses, piggyback contact lens system, hybrid contact lenses, and scleral and corneoscleral contact lenses form the contemporary range of available lens types for keratoconus management with contact lenses. All of them try to restore the vision, improve the quality of life, and delay surgical procedures in patients with this disease. Complications are derived from the intolerance of using contact lens, and the use of each depends on keratoconus severity.Conclusions. In the context of nonsurgical procedures, the use of contact lenses for the management of keratoconic patients represents a good alternative to restore vision and improve the quality of live in this population.

scholarly journals Visual Performance and Optical Quality of Standardized Asymmetric Soft Contact Lenses in Patients With Keratoconus

2017 ◽  
Vol 58 (7) ◽  
pp. 2899 ◽  
Author(s):  
Asaki Suzaki ◽  
Naoyuki Maeda ◽  
Mutsumi Fuchihata ◽  
Shizuka Koh ◽  
Kohji Nishida ◽  
...  
Keyword(s):  
Contact Lenses ◽  
Optical Quality ◽  
Visual Performance ◽  
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.

(CL-223)QUALITY OF RETINAL IMAGE WITH SOFT CONTACT LENSES DESIGNED TO CORRECT PRESBYOPIA

2000 ◽  
Vol 77 (SUPPLEMENT) ◽  
pp. 196
Author(s):  
Nikole L. Himebaugh ◽  
Larry N. Thibos ◽  
Sarita P. Soni
Keyword(s):  
Retinal Image ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses

scholarly journals Optical Correction of Keratoconus with a Scleral Gas-Permeable Lenses

2019 ◽  
Vol 16 (2) ◽  
pp. 218-224
Author(s):  
A. V. Myagkov ◽  
Yu. B. Slonimskiy ◽  
E. V. Belousova ◽  
T. S. Mitichkina ◽  
L. R. Bunyatova
Keyword(s):  
Contact Lenses ◽  
Optical Aberrations ◽  
Soft Contact ◽  
Light Refraction ◽  
Soft Contact Lenses ◽  
Optical Correction ◽  
Third Stage ◽  
Therapeutic Measures ◽  
Further Development

The optical properties of the cornea are determined by its ability to refract and transmit light. Keratoconus changes cornea’s shape, the surface of the cornea becomes irregular, which leads to a violation of light refraction and the occurrence of optical aberrations. The progressing course of the disease and its late detection lead to a delayed start of therapeutic measures, which affects the prognosis of the disease progression and reduces the patient’s quality of life. The quality of visual functions depends on the stage of the process. There are 4 stages of keratoconus (according to M. Asler), each of which corresponds to certain changes in refraction and degree of deformation of the cornea. Early biomicroscopic signs are: “dilution” of the stroma (inhomogeneity of the cornea and a grayish tint in the zone of the developing apex), change in the shape of endothelial cells and clearly visible nerve endings due to longitudinal thickening. In the second stage of keratoconus, the biomicroscopic picture is complemented by the appearance of keratoconus lines (Vogt’s striae). The opacities of the Bowman’s membrane indicate the beginning of the scarring process and the transition of the disease to its third stage. The fourth stage of the disease is characterized by further development of stromal opacities and the occurrence of gross changes of the Descemet’s membrane. Advanced medical equipment for topographic mapping and measuring the cornea makes it much easier for ophthalmologists to diagnose keratoconus and choose more effective treatment methods: crosslinking or surgical treatment. Later it allows to stabilize keratoconus, but does not provide high visual acuity due to the induction of optical aberrations, including high order optical aberrations. Contact lens vision correction is the main way to correct the refractive error resulting from keratoconus. However, the use of corneal gas permeable or soft contact lenses cannot provide high quality vision, additionally causing discomfort associated with their excessive mobility. The use of scleral gas permeable contact lenses is the most effective method of optical correction of all stages of keratoconus and after keratoplasty.

A comparison of toric and spherical soft contact lenses on visual quality of life and ease of fitting in astigmatic patients

2018 ◽  
Vol 41 ◽  
pp. S42 ◽  
Author(s):  
Jason Nichols ◽  
David Berntsen ◽  
Katherine Bickle ◽  
Stephanie Cox ◽  
Jessica Mathew ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Contact Lenses ◽  
Visual Quality ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Visual Quality Of Life ◽  
Fitting In
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