scholarly journals Which feature influences on-eye power change of soft toric contact lenses: Design or corneal shape?

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242243
Author(s):  
Tamsin Doll ◽  
Joshua Moore ◽  
Ahmad H. Shihab ◽  
Bernardo T. Lopes ◽  
Ashkan Eliasy ◽  
...  
Keyword(s):  
Contact Lenses ◽  
Peripheral Zone ◽  
Lens Design ◽  
Strong Correlations ◽  
Soft Contact ◽  
Effective Power ◽  
Soft Contact Lenses ◽  
Power Change ◽  
Corneal Shape ◽  
The Impact

Purpose This study investigates how both the peripheral zone design and corneal shape affect the behaviour of soft contact lenses on-eye. Methods In this study, soft contact lenses of varying nominal cylindrical powers and peripheral zone designs—a single-prism gravity-based stabilised lens (G1P), two-prism blink-based stabilised lens (B2P) and four-prism blink-based stabilised lens (B4P)—were generated as finite element models. The on-eye simulation results were analysed to identify the impact of each peripheral zone design (Each with different volume ratios) on the effective power change (EPC) when worn by a subject. Topographies of three eyes of varying average simulated anterior corneal curvature (flat, average & steep) were used in this study. Results The volume of the lens’s peripheral zone as a ratio of the total lens volume (Vp) recorded very weak correlations with the effective power change (EPC) among the three investigated designs when they were fitted to the flat eye (R = -0.19, -0.15 & -0.22 respectively), moderate correlations with the average eye (R = 0.42, 0.43 & 0.43 respectively) and strong correlations with the steep eye (R = 0.91, 0.9 & 0.9 respectively). No significant differences were noticed among the three investigated designs and none of the cylindrical lenses designed with axis 90° recorded EPC values outside the acceptance criteria range (ACR) of ±0.25 D. No significant differences in EPC were recorded among the three designs G1P, B2P and B4P (p>0.6) when they were designed with three axes at 90°, 45° and 0°. Moving the toric lens axis away from 90° dragged the EPC to the negative side and most of the investigated lenses with axes at 45° and 0° recorded EPCs outside the ±0.25D range. Conclusions In all cases, the shape of the cornea had a more dominant effect on EPC when compared to the peripheral zone design. Corneal shape influences the soft toric contact lens’s on-eye power change more than the lens design.

scholarly journals The impact of wearing single vision soft contact lenses on the peripheral refractive error

F1000Research ◽  
2016 ◽  
Vol 5 ◽  
pp. 2803
Author(s):  
Kareem Allinjawi ◽  
Sharanjeet-Kaur Sharanjeet-Kaur ◽  
Saadah Mohamed Akhir ◽  
Haliza Abdul Mutalib
Keyword(s):  
Visual Field ◽  
Open Field ◽  
Refractive Error ◽  
Contact Lens ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Single Vision ◽  
The Right ◽  
The Impact

Aim: The purpose of this study was to determine the changes in the relative peripheral refractive error produced by soft single vision contact lenses in myopic schoolchildren. Methods: 27 myopic schoolchildren aged between 13 to 15 years were included in this study. The measurements of central and peripheral refraction were made only on the right eye using a Grand-Seiko WR-5100K open-field autorefractometer without contact lens (WL), and with wearing single vision contact lens (SVCL). Refractive power was measured at center and horizontal eccentricity between 35° temporal to 35° nasal visual field (in 5° steps). Results: SVCL showed an increase in peripheral hyperopic defocus at the nasal and temporal visual field compare with baseline, but this change was not statistically significant (p=0.129). Conclusion: Wearing single vision soft contact lenses increases the relative peripheral hyperopic defocus in myopic schoolchildren.

scholarly journals A Clinical Study of the Impact of Soft Contact Lenses on the Progression of Myopia in Young Patients

2022 ◽  
Vol Volume 16 ◽  
pp. 51-62
Author(s):  
Andrzej Malinowski ◽  
Małgorzata Mrugacz ◽  
Marcin Stopa ◽  
Erita Filipek ◽  
Anna Moniuszko-Malinowska ◽  
...  
Keyword(s):  
Clinical Study ◽  
Contact Lenses ◽  
Young Patients ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
The Impact

Air Travel and Contact Lenses: A Laboratory Study

1988 ◽  
Vol 32 (6) ◽  
pp. 450-454
Author(s):  
Joseph E. Laviana ◽  
Frederick H. Rohles
Keyword(s):  
Relative Humidity ◽  
Contact Lenses ◽  
Flight Time ◽  
Air Travel ◽  
The Other ◽  
Laboratory Setting ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Significant Difference ◽  
The Impact

The cabin of an inflight aircraft contains approximately 10% relative humidity (rh). To investigate the impact of this environment on eye comfort, an inflight humidity profile was simulated in a controlled laboratory setting. The experiment was replicated 3 times using a group of 4 subjects (2 males; 2 females) per test. Participants served in both control and experimental roles by wearing a hydrophilic contact lens on one eye and no lens on the other. Subjects provided evaluations of “eye comfort” for both eyes (contact and naked) at specified intervals during the 10 hour test. The results indicated that at 10% rh, there was no significant difference in eye comfort for either wearers or nonwearers of soft contact lenses. However, comfort decreased with the length of exposure (flight time), and for durations of six hours or longer a significant annoyance was reported.

scholarly journals The impact of silicone hydrogel contact lenses on the measurement of intraocular pressure using non-contact tonometry

2017 ◽  
Vol 74 (8) ◽  
pp. 763-766 ◽  
Author(s):  
Snezana Pesic ◽  
Svetlana Jovanovic ◽  
Milos Mitrasevic ◽  
Biljana Vuletic ◽  
Milena Jovanovic ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Contact Lenses ◽  
Accurate Method ◽  
Contact Method ◽  
Soft Contact ◽  
Silicone Hydrogel ◽  
Soft Contact Lenses ◽  
Significant Difference ◽  
The Impact ◽  
Noncontact Tonometry

Background/Aim. Measurement of intraocular pressure (IOP) over therapeutic silicone hydrogel soft contact lenses by a non-contact method of tonometry could be applied in opthalmologic practice but the results obtained are still controversial. The aim of this study was to evaluate the effect of spherically designed silicone hydrogel soft contact lenses and their power on values of IOP measured by using a noncontact tonometry method. Methods. We measured IOP with and without spherical silicone hydrogel soft contact lenses on 143 eyes of 80 subjects who did not have any ocular or systemic diseases. Results. The Wilcoxon statistical analysis test for ranking average values of IOP measured on 143 eyes over a spherical silicone hydrogel soft contact lenses showed significantly higher values compared to those measured with no contact lenses (15.81 ? 3.46 mm Hg vs 14.54 ? 3.19 mm Hg; respectively; Z = -5.224, p = 0.001). Refractive power analysis of the contact lenses of -9.00D to +6.00 D showed a significant difference of IOP in the range from 0.00D to -6.00D. Conclusion. Non-contact tonometry is not an accurate method of IOP measuring over spherical silicone hydrogel soft contact lenses which belong to therapeutic contact lenses.

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.

Peculiarities of cultivation of the monolayer of fetal fibroblasts on the soft contact lenses, with contain the collagen

2009 ◽  
Vol 21 (5) ◽  
pp. 46-50
Author(s):  
N. Pasechnikova ◽  
◽  
G. Drozhzhina ◽  
O. Ivanova ◽  
I. Nasinnik ◽  
...  
Keyword(s):  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Fetal Fibroblasts

Modification of therapeutic silicone-hydrogel soft contact lenses

2016 ◽  
Vol 16 (3) ◽  
pp. 117-120 ◽  
Author(s):  
T.N. Safonova ◽  
◽  
I.A. Novikov ◽  
V.I. Boev ◽  
O.V. Gladkova ◽  
...  
Keyword(s):  
Contact Lenses ◽  
Soft Contact ◽  
Silicone Hydrogel ◽  
Soft Contact Lenses

scholarly journals Myopia Control with Combination Low-Dose Atropine and Peripheral Defocus Soft Contact Lenses: A Case Series

2021 ◽  
pp. 548-554
Author(s):  
Nir Erdinest ◽  
Naomi London ◽  
Nadav Levinger ◽  
Yair Morad
Keyword(s):  
Low Dose ◽  
Contact Lenses ◽  
Case Series ◽  
Concentric Circle ◽  
Retrospective Case ◽  
Soft Contact ◽  
Myopia Progression ◽  
Soft Contact Lenses ◽  
Center Distance ◽  
Myopia Control

The goal of this retrospective case series is to demonstrate the effectivity of combination low-dose atropine therapy with peripheral defocus, double concentric circle design with a center distance soft contact lenses at controlling myopia progression over 1 year of treatment. Included in this series are 3 female children aged 8–10 years with progressing myopia averaging −4.37 ± 0.88 D at the beginning of treatment. Their average annual myopic progression during the 3 years prior to therapy was 1.12 ± 0.75 D. They had not attempted any myopia control treatments prior to this therapy. The children were treated with a combination of 0.01% atropine therapy with spherical peripheral defocus daily replacement soft lenses MiSight<sup>®</sup> 1 day (Cooper Vision, Phoenix, AZ, USA). They underwent cycloplegic refraction, and a slit-lamp evaluation every 6 months which confirmed no adverse reactions or staining was present. Each of the 3 children exhibited an average of 0.25 ± 0.25 D of myopia progression at the end of 1 year of treatment. To the best of the authors’ knowledge, this is the first published study exhibiting that combining low-dose atropine and peripheral defocus soft contact lenses is effective at controlling children’s moderate to severe myopia progression during 1 year of therapy.

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