scholarly journals Which soft contact lens power is better for piggyback fitting in keratoconus?

2013 ◽  
Vol 36 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Miguel Romero-Jiménez ◽  
Jacinto Santodomingo-Rubido ◽  
Patricia Flores-Rodríguez ◽  
Jose Manuel González-Méijome
Keyword(s):  
Contact Lens ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Lens Power ◽  
Fitting In

Anomalies in the Prescribing of Soft Contact Lens Power

2009 ◽  
Vol 35 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Graeme Young ◽  
Kurt Moody ◽  
Anna Sulley
Keyword(s):  
Contact Lens ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Lens Power

scholarly journals Simulation of the Effect of Material Properties on Soft Contact Lens On-Eye Power

2019 ◽  
Vol 6 (4) ◽  
pp. 94
Author(s):  
Joshua Moore ◽  
Bernardo T. Lopes ◽  
Ashkan Eliasy ◽  
Brendan Geraghty ◽  
Richard Wu ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Contact Lens ◽  
Material Properties ◽  
Experimental Testing ◽  
Uniaxial Tensile ◽  
Soft Contact ◽  
Silicone Hydrogel ◽  
Soft Contact Lens ◽  
Lens Power

Purpose: To evaluate the variation in the optical power achieved following soft contact lens eye fitting for spherical and cylindrical lenses with differing hydrogel material properties. Methods: Uniaxial tensile tests were performed on four hydrogel materials 77% water-content (w-c) hydrogel, 74% w-c blue silicone hydrogel, 74% w-c clear silicone hydrogel, and 64% w-c clear hydrogel (shortly referred to as H77p0, SiH74p5-blue, SiH74p5-clear, and H64p0-clear), under loading conditions that would be expected in vivo. Finite element models of the cornea and contact lens interaction were generated using spherical and cylindrical lenses with powers varying from −10 to +20 D; overall diameters of either 13.5, 14.0, or 14.5 mm; and with material properties matching those determined through experimental testing. Results: The moduli of elasticity for each of the tested hydrogel materials were 0.195 ± 0.027 MPa, 0.277 ± 0.019 MPa, 0.279 ± 0.01 MPa, and 0.457 ± 0.013 MPa for H77p0, SiH74p5-blue, SiH74p5-clear, and H64p0 respectively. The calculated values of effective power change (EPC) showed strong negative correlations with lens power. This was particularly apparent in the higher end of the lens power spectrum (over +5 D), where each of the materials demonstrated a highly linear reduction in EPC with increased lens power. Conclusions: Soft contact lenses composed of a stiffer hydrogel are far more resilient to changes in EPC across the lower end of the lens power spectrum (−10 to +5 D). Beyond this range, the material choice does not have a significant effect on the EPC.

The Impact of Eyelid and Eye Contour Factors on a Toric Soft Contact Lens Fitting in Chinese Subjects

2014 ◽  
Vol 40 (2) ◽  
pp. 65-70 ◽  
Author(s):  
Wanqing Jin ◽  
Nan Jin ◽  
Yunyun Chen ◽  
Xinjie Mao ◽  
Suzhong Xu ◽  
...  
Keyword(s):  
Contact Lens ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Fitting In ◽  
The Impact ◽  
Chinese Subjects ◽  
Contact Lens Fitting

Comparing the microflora of the conjunctiva and contact lens in therapeutic soft contact lens wearers

2020 ◽  
Vol 89 (6) ◽  
pp. 8-13
Author(s):  
T. A Veliksar ◽  
◽  
T. B. Gaidamaka ◽  
G. I. Drozhzhina ◽  
A. L. Molodaia ◽  
...  
Keyword(s):  
Contact Lens ◽  
Soft Contact ◽  
Soft Contact Lens

Prevalence of ‘sensitive eyes’ in soft contact lens wearers

2012 ◽  
Vol 35 ◽  
pp. e19-e20
Author(s):  
Sheila B. Hickson-Curran ◽  
Michael Spyridon ◽  
Chris Hunt ◽  
Graeme Young
Keyword(s):  
Contact Lens ◽  
Soft Contact ◽  
Soft Contact Lens
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