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.

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 The Effectiveness of Different Optical Correction Methods in Children and Adolescents with Progressive Myopia Based on a Comparative Evaluation of the Accommodation and Axial Length of Eyes

2018 ◽  
Vol 15 (2S) ◽  
pp. 65-72 ◽  
Author(s):  
M. M. Sitka ◽  
S. G. Bodrova ◽  
N. A. Pozdeyeva
Keyword(s):  
Children And Adolescents ◽  
Axial Length ◽  
Contact Lenses ◽  
Control Group ◽  
Soft Contact ◽  
Axial Elongation ◽  
Soft Contact Lenses ◽  
Optical Correction ◽  
Progressive Myopia

Objective: to determine optimal method of progressive myopia optical correction in children and adolescents.Patients and methods. Conducted 5-year prospective clinical and instrumental examination of 494 children with myopia using orthokeratology lenses, soft contact lenses and glasses. 61 children (the average age 11.7 ± 2.36 years) with myopia –2.87 ± 1.1 D and astigmatism –0.58 ± 0.27 D used orthokeratological lens. 92 children (the average age 12.8 ± 1.51 years) with myopia –3.66 ± 1.07 D, astigmatism –0.53 ± 0.18 D wore soft contact lens. 79 children (the average age 11.52 ± 1.78 years) with myopia –1.59 ± 1.08 D, astigmatism –0.71 ± 0.54 D used glasses with monofocal lenses, with full correction. The control group consisted of 249 children (the average age 9.1 ± 1.14 years) with initial emmetropia. Determination of refraction, subjective and objective determination of accommodation, and axial length of the eye (“IOL-master”) was conducted in children.Results. The maximum progression of myopia was observed in younger children (8–9 years). Correction of myopia with orthokeratology lenses (OKLs) was accompanied by the lowest dynamics of changes in axial length (axial elongation 0,44 ± 0,32 mm) compared to the correction with soft contact lenses (SCLs) (axial elongation 0,73 ± 0,36 mm), spectacle correction (axial elongation 1,39 ± 0,47 mm) and the control group (axial elongation 0,6 ± 0,41 mm). In all children with myopia, at the beginning of the study, there were reduced values reserve of relative accommodation and an objective accommodative response. Correction of myopia with OKLs (p = 0,0002) and SCLs (p = 0,036) provides the normalization of subjective and objective reserve indication of relative accommodation in both age group in comparison of spectacles correction.Conclusion. Correction with orthokeratology lens in children with progressive myopia contributes to the minimum growth length of the eye. Correction of myopia OKLs and MKL improves of subjective and objective indicators of relative accommodation reserve. 

scholarly journals Strategy for correcting congenital progressive high myopia with astigmatism

2020 ◽  
Vol 15 (2) ◽  
pp. 15-18
Author(s):  
Elena P. Tarutta ◽  
Gajane A. Markosian ◽  
Natalia A. Tarasova
Keyword(s):  
High Myopia ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Spherical Component ◽  
Optical Correction

The article presents a strategy for optical correction of congenital progressive high myopia with astigmatism, including bioptic correction with a combination of soft contact lenses and glasses. First, monofocal soft contact lenses are selected in accordance with the spherical component, and then the residual astigmatism is determined and correct with additional cylindrical glasses with perifocal refractive gain. This allows correcting both the central and peripheral defocus simultaneously.

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

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

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 Influence of Face Masks on the Use of Contact Lenses

2021 ◽  
Vol 18 (14) ◽  
pp. 7407
Author(s):  
Clara Martinez-Perez ◽  
Bruno Monteiro ◽  
Mafalda Soares ◽  
Fatima Portugues ◽  
Sonia Matos ◽  
...  
Keyword(s):  
Dry Eye ◽  
Contact Lenses ◽  
Visual Quality ◽  
Face Mask ◽  
Soft Contact ◽  
Dry Eyes ◽  
Soft Contact Lenses ◽  
Eye Symptoms ◽  
The Impact

Background: The COVID-19 epidemic is largely controlled by the use of face masks. The use of a face mask has been indicated as a strong cause of dry eye, although it is not yet described in the literature. This study aims to compare the impact of the use of masks on the visual quality of patients. The symptoms in the human eye intensified during the pandemic versus the symptoms before the pandemic, in a Portuguese population. Methods: A fifteen-question questionnaire was conducted to find out what changes occurred in the use of soft contact lenses during the pandemic in relation to the use of masks. Statistical analysis was performed with SPSS 27.0 software (SPSS Inc., Chicago, IL, USA). Results: The use of contact lenses decreased compared with before the pandemic (p < 0.001). The number of hours of wear decreased significantly compared with before the pandemic (p < 0.001). The sensation of dry eyes was found to be worse in those using monthly replacement contact lenses (p = 0.034), and the need to remove contact lenses was more frequent in women (p = 0.026) after using a mask. Conclusions: Mask use increases dry eye symptoms in contact lens wearers, negatively impacting visual quality.

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