scholarly journals MR finishing of 220mm diameter aspheric lenses with the QED's Q22

2002 ◽  
Author(s):  
John Johnson ◽  
Gary Ginter
Keyword(s):  
Aspheric Lenses

Development of Bridge Tooling for Fabricating Mold Inserts of Aspheric Optical Lens

2012 ◽  
Vol 516 ◽  
pp. 228-233
Author(s):  
Chil Chyuan Kuo ◽  
Zhi Yang Lin
Keyword(s):  
Success Rate ◽  
Silicone Rubber ◽  
Low Cost ◽  
Fabrication Process ◽  
Optical Lens ◽  
Aspheric Lenses

Bridge tooling has been developed for fabricating the temporary mould inserts of aspheric lenses using silicone rubber materials. Prototype material for aspheric lenses is not recommended as quartz due to the low success rate in the fabrication process. This technology provides a fast, low cost and highly successful rate of fabricating the epoxy-based composite mould inserts of plastic aspheric optical lenses.

Scanning Acoustic Microscopy of Solid Objects Using Aspheric Lenses

1982 ◽  
pp. 1-19 ◽  
Author(s):  
Frank Pino ◽  
David A. Sinclair ◽  
Eric A. Ash
Keyword(s):  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
Solid Objects ◽  
Aspheric Lenses

Testing aspheric lenses: New approaches

2010 ◽  
Vol 46 (4) ◽  
pp. 329-339 ◽  
Author(s):  
W. Osten ◽  
B. Dörband ◽  
E. Garbusi ◽  
Ch. Pruss ◽  
L. Seifert
Keyword(s):  
New Approaches ◽  
Aspheric Lenses

scholarly journals Manipulating quantum states with aspheric lenses

2005 ◽  
Vol 344 (5) ◽  
pp. 346-350 ◽  
Author(s):  
Zhi-Wei Wang ◽  
Xi-Feng Ren ◽  
Yun-Feng Huang ◽  
Yong-Sheng Zhang ◽  
Guang-Can Guo
Keyword(s):  
Quantum States ◽  
Aspheric Lenses

Keratoconic Bi-aspheric Contact Lenses

2016 ◽  
Vol 5 (3) ◽  
pp. 132-138
Author(s):  
Ariela Gordon-Shaag ◽  
Philip Fine ◽  
Liat Gantz ◽  
Arige Gideon-Abousaid ◽  
Gad Serero
Keyword(s):  
Visual Acuity ◽  
Contact Lenses ◽  
Case Series ◽  
Visual Stability ◽  
Wavefront Aberrations ◽  
Body Sensation ◽  
Quality Of Vision ◽  
Base Curve ◽  
Aspheric Lenses

ABSTRACT Aim This observational clinical case series examined patients with keratoconus (KC) fit with keratoconic bi-aspheric (KBA) lenses to assess visual acuity (VA), wavefront aberrations, physiological fitting, subjective comfort, and manufacturer's fitting guidelines. Materials and methods Seven adult patients (11 eyes, four females, mean age: 34.15 ± 14.12) with nipple cones from the Hadassah Academic College contact lens clinic (Jerusalem, Israel) were fit with KBA lenses by modifying the initial base curve (BC) to obtain an acceptable physiological fit. The uncorrected and corrected distance (D) and near (N) Snellen VA and the ocular wavefront measurements, and responses to a self-administered five-point scale questionnaire were compared after 2 weeks of wear using paired two-tailed t-test or Mann-Whitney U test, as appropriate. Results Visual acuity and total root mean square (RMS) improved significantly with the lenses (DVAuncorrected = 0.04 ± 0.02, DVAcorrected = 0.66 ± 0. 22, NVAuncorrected = 0.34 ± 0.30, NVAcorrected = 0.95 ± 0.12). Subjects reported an average of 7.0 ± 2.7 hours of wear daily, with good scores in visual stability, satisfaction with VA and quality of vision, improvement of mood and quality of life, and low scores in foreign body sensation, pain, red eye, and itching during wear, and difficulty with lens removal. An average of two BC modifications from the diagnostic lens were necessary (0.16 mm steeper in nine eyes, 0.27 mm flatter in two eyes). Conclusion Keratoconic bi-aspheric lenses can provide 7 hours of comfortable wear, significantly improved VA and total RMS aberrations, alongside subjective satisfaction. Base curve modifications can be reduced by fitting a diagnostic lens 0.75 mm steeper than the flattest keratometry reading. How to cite this article Gantz L, Gordon-Shaag A, Gideon-Abousaid A, Serero G, Fine P. Keratoconic Bi-aspheric Contact Lenses. Int J Kerat Ect Cor Dis 2016;5(3):132-138.

Precision Molded Aspheric Lenses For A Camera And For A Compact Disc System

1986 ◽  
Author(s):  
Tetsuro Izumitani ◽  
Shinichiro Hirota ◽  
Isao Ishibai ◽  
Ryuji Kobayashi
Keyword(s):  
Compact Disc ◽  
Aspheric Lenses

Noncontact three-dimensional quantitative profiling of fast aspheric lenses by optical coherence tomography

2016 ◽  
Vol 5 (5-6) ◽  
Author(s):  
Bujagouni Karthik Goud ◽  
Dinesh Venkatesh Udupa ◽  
Chilakala Prathap ◽  
Deepak Dilip Shinde ◽  
Kompalli Divakar Rao ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Three Dimensional ◽  
Length Distribution ◽  
Least Square ◽  
Rapid Screening ◽  
Radius Of Curvature ◽  
Optical Coherence ◽  
Aspheric Surface ◽  
Aspheric Lens ◽  
Aspheric Lenses

AbstractThe use of optical coherence tomography (OCT) for noncontact three-dimensional aspheric lens profiling and retrieval of aspheric surface parameters is demonstrated. Two commercially available aspheric lenses with different focal length-to-diameter ratio have been imaged using OCT, and the measured optical path length distribution has been least square fitted with the aspheric lens surface retrieving the radius of curvature, aspheric constant, and conic constants. The refractive index of these lenses has also been measured referencing with a standard Zerodur glass flat. The fitted aspheric surface coefficients of the lenses are in close agreement with the manufacturer’s values, thus, envisaging the potential of OCT in rapid screening, testing of aspheric lenses, and other micro-optical components such as those used in illumination optics.

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