scholarly journals Holographic progressive lenses

2018 ◽  
Author(s):  
Jannik Trapp ◽  
Manuel Decker ◽  
Thomas Pertsch ◽  
Toufic Jabbour ◽  
Jörg Petschulat
Keyword(s):  
Progressive Lenses

Influence of Progressive Lenses in the Retinal Image Quality

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 156-156
Author(s):  
J Gispets ◽  
M Arjona ◽  
J Pujol
Keyword(s):  
Image Quality ◽  
Retinal Image ◽  
Human Subjects ◽  
Optical Quality ◽  
Optical Systems ◽  
Modulation Transfer ◽  
Double Pass ◽  
Progressive Lenses

Progressive lenses (PL) are widely used to correct presbyopia, a visual dysfunction that affects most of the population aged over 40 years. The methods used to evaluate the optical quality of these lenses are mainly based on ray-tracing and optical bench testing. Psychophysical studies based on measurements of the contrast sensitivity function of human subjects also exist. However, all these methods exhibit important limitations because, in general, they do not take into account the optics of the eye. One of the objective techniques that permits evaluation of the retinal image in-vivo is the double pass method (Santamaria et al, 1987 Journal of the Optical Society of America A4 1109 – 1114). It has been possible to study the retinal image quality for different correcting optical systems, such as contact lenses, with this technique (Torrents et al, 1996 Perception25 Supplement, 112 – 113). We studied the retinal image quality of the optical system formed by the eye and a progressive lens. The retinal image quality, characterised by the modulation transfer function (MTF), was measured for different observers as a variety of lines of sight that covered a lens diameter of 50 mm. We show the MTF variation as a function of the lens region and the capacity of this technique to characterise these optical systems.

scholarly journals The VEPRO trial: A cross-over randomised controlled trial comparing 2 progressive lenses for patients with presbyopia

Trials ◽  
2008 ◽  
Vol 9 (1) ◽  
Author(s):  
Isabelle Boutron ◽  
Caroline Touizer ◽  
Isabelle Pitrou ◽  
Carine Roy ◽  
Philippe Ravaud
Keyword(s):  
Randomised Controlled Trial ◽  
Controlled Trial ◽  
Randomised Controlled ◽  
Progressive Lenses

The Application of Surface Fairing Technique in Progressive Lens Processing

2007 ◽  
Vol 364-366 ◽  
pp. 1246-1250
Author(s):  
Jian Jun Du ◽  
Suet To ◽  
Chi Fai Cheung ◽  
Wing Bun Lee ◽  
Xiang Wen Miao
Keyword(s):  
Single Point ◽  
Least Square ◽  
Spline Method ◽  
Diamond Cutting ◽  
B Spline ◽  
Ultra Precision ◽  
Progressive Lenses

Based on the analysis of characteristics of progressive lens, it can be found that lens uneven change of curvature is an important reason of defect on progressive lens processed by single-point diamond cutting technique. By applying least square fairing method to fair the surface which is fitted and interpolated by Double Cubic B-Spline method, the curvature change of progressive surface becomes even. The processing experiment shows that the method in this paper can eliminate the defect effectively in the ultra-precision processing of progressive lenses.

Using Wavefront Tracing for the Visualization and Optimization of Progressive Lenses

1998 ◽  
Vol 17 (3) ◽  
pp. 255-265 ◽  
Author(s):  
J. Loos ◽  
Ph. Slusallek ◽  
H.-P. Seidel
Keyword(s):  
Progressive Lenses
Sign in / Sign up

Export Citation Format

Share Document