Ophthalmic optics. Semi-finished spectacle lens blanks

2016 ◽  
Keyword(s):  
Spectacle Lens

scholarly journals Computer vision syndrome in presbyopia and beginning presbyopia: effects of spectacle lens type

2015 ◽  
Vol 98 (3) ◽  
pp. 228-233 ◽  
Author(s):  
Wolfgang Jaschinski ◽  
Mirjam König ◽  
Tiofil M. Mekontso ◽  
Arne Ohlendorf ◽  
Monique Welscher
Keyword(s):  
Computer Vision ◽  
Spectacle Lens ◽  
Computer Vision Syndrome

scholarly journals Severe Astigmatic Blur Does Not Interfere with Spectacle Lens Compensation

2003 ◽  
Vol 44 (2) ◽  
pp. 449 ◽  
Author(s):  
Rhondalyn C. McLean ◽  
Josh Wallman
Keyword(s):  
Spectacle Lens

ZERNIKE ASTIGMATISM AND VISUAL PERFORMANCE IN MYOPIC EYES BY RIGID GAS PERMEABLE CONTACT LENSES WEAR

2012 ◽  
Vol 05 (03) ◽  
pp. 1250013
Author(s):  
JINHUA BAO ◽  
XINJIE MAO ◽  
HAIRONG WANG ◽  
JI C. HE ◽  
FAN LU
Keyword(s):  
Visual Acuity ◽  
Contact Lenses ◽  
Main Axis ◽  
Visual Performance ◽  
Wavefront Sensor ◽  
Spherical Equivalent ◽  
Spectacle Lens ◽  
Visual Improvement ◽  
Refractive Correction ◽  
Lens Wear

Purpose: To investigate the effects of rigid-gas-permeable contact lens (RGP-CL) wear on Zernike astigmatism and visual performance in myopic eyes. Methods: A wavefront sensor was used to evaluate Zernike astigmatism for 21 eyes with minimum astigmatism and 18 eyes with moderate astigmatism under three different modes of refractive correction: the RGP-CL, spectacle lens correcting spherical equivalent (SL) and spectacle lens fully correcting spherical error and astigmatism (fSL). Contrast visual acuity was assessed with a VA tester at four contrast levels and two luminance backgrounds. Results: Compared to the SL wear, RGP-CL wear changed the main axis astigmatism [Formula: see text] from -0.09 ± 0.34 to 0.34 ± 0.22 for the minimum astigmatism group, while the contrast VA was improved about 0.05 LogMAR (F = 8.06, p < 0.01). For the group with moderate astigmatism, significant reduction in [Formula: see text] was found for both fSL wear (t = 4.78, p < 0.001) and RGP-CL wear (t = 6.29, p < 0.0001). The changes in astigmatism were significantly correlated between the fSL and RGP-CL wears (r = 0.897, p < 0.0001 for [Formula: see text]; and r = 0.643, p = 0.004 for [Formula: see text]. Contrast VA was significantly improved for both fSL and RGP-CL wears and the improvements were significantly correlated between each other for all four contrast levels and two backgrounds. Conclusion: RGP-CL wear induces astigmatism for the eyes with minor astigmatism probably due to a correction of corneal astigmatism and thus a manifesting of the lens astigmatism. For the astigmatic eyes, RGP-CL wear has similar effect on correcting astigmatism as the spectacle lens wear with spherical-cylinder correction and also produces similar visual improvement.

The effect of under and over refractive correction on visual performance and spectacle lens acceptance

2001 ◽  
Vol 21 (4) ◽  
pp. 255-261 ◽  
Author(s):  
David A. Atchison ◽  
Katrina L. Schmid ◽  
Katie P. Edwards ◽  
Sharon M. Muller ◽  
Jayne Robotham
Keyword(s):  
Visual Performance ◽  
Spectacle Lens ◽  
Refractive Correction

THE SPECTACLE LENS APERTURE

1944 ◽  
Vol 27 (3) ◽  
pp. 104-115
Author(s):  
JOHN D. SPOONER
Keyword(s):  
Spectacle Lens ◽  
Lens Aperture
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