Development of an Aspheric Lens Surface

1950 ◽  
Vol 18 (6) ◽  
pp. 385-387 ◽  
Author(s):  
Herman C. Schepler
Keyword(s):  
Aspheric Lens ◽  
Lens Surface

Fabrication of the antireflection structure on aspheric lens surface and lens holder

2018 ◽  
Vol 191 ◽  
pp. 97-103 ◽  
Author(s):  
Ichiro Mano ◽  
Tomoya Uchida ◽  
Jun Taniguchi
Keyword(s):  
Aspheric Lens ◽  
Lens Surface

Effects of Grinding Wheel Vibration on Surface Quality of Axisymmetric Aspheric Lens

2010 ◽  
Vol 97-101 ◽  
pp. 2111-2114 ◽  
Author(s):  
Guo Bi ◽  
Yin Biao Guo ◽  
Kun Pan ◽  
Chen Jiang
Keyword(s):  
Surface Quality ◽  
Grinding Wheel ◽  
Machining Accuracy ◽  
Precision Grinding ◽  
Aspheric Lens ◽  
Wheel Vibration ◽  
Lens Surface ◽  
Micro Topography ◽  
Lens Center

Minute vibration of grinding wheel greatly restricts machining accuracy of axisymmetric aspheric surface in precision grinding. This paper is dedicated to analysis micro-topography of grinding surface under grinding wheel vibration. The relative motion track of wheel to ideal lens surface and the interference of them are involved to study the effects of grinding wheel vibration on surface quality. For different operation parameters, the processed surface presents various micro-topography, and the restriction extent of vibration to surface quality is also different. Vibration waveform in the region near lens center is smoothed greatly by the interference of wheel and the processed surface. Therefore, surface quality gets some improvement from edge to center for axisymmetric aspheric lens. Experiment results verified the validity of the theoretical analysis.

Characterization of ZnSe aspheric lens

1997 ◽  
Author(s):  
Keiji Ebata ◽  
Manabu Shiozaki ◽  
Keiji Fuse ◽  
Tatsuya Kyotani
Keyword(s):  
Aspheric Lens

Repair of damaged lens surface of CPV using silica based coating

2015 ◽  
Author(s):  
Shota Kurogi ◽  
Takuya Hirohata ◽  
Nawwar Ahmad ◽  
Yasuyuki Ota ◽  
Kensuke Nishioka
Keyword(s):  
Lens Surface

scholarly journals The Efficacy of an Acrylic Intraocular Lens Surface Modified with Polyethylene Glycol in Posterior Capsular Opacification

2007 ◽  
Vol 22 (3) ◽  
pp. 502 ◽  
Author(s):  
Hyeon Il Lee ◽  
Mee Kum Kim ◽  
Jung Hwa Ko ◽  
Hyun Ju Lee ◽  
Won Ryang Wee ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Intraocular Lens ◽  
Posterior Capsular Opacification ◽  
Surface Modified ◽  
Lens Surface

Volume change of the ocular lens during accommodation

2007 ◽  
Vol 293 (2) ◽  
pp. C797-C804 ◽  
Author(s):  
R. Gerometta ◽  
A. C. Zamudio ◽  
D. P. Escobar ◽  
O. A. Candia
Keyword(s):  
Structural Parameters ◽  
Center Of Mass ◽  
Physiological Solution ◽  
Volume Determination ◽  
Cross Sectional ◽  
Lens Fibers ◽  
Human Lenses ◽  
Lens Surface ◽  
Shape Changes ◽  
Anterior Posterior

During accommodation, mammalian lenses change shape from a rounder configuration (near focusing) to a flatter one (distance focusing). Thus the lens must have the capacity to change its volume, capsular surface area, or both. Because lens topology is similar to a torus, we developed an approach that allows volume determination from the lens cross-sectional area (CSA). The CSA was obtained from photographs taken perpendicularly to the lenticular anterior-posterior (A-P) axis and computed with software. We calculated the volume of isolated bovine lenses in conditions simulating accommodation by forcing shape changes with a custom-built stretching device in which the ciliary body-zonulae-lens complex (CB-Z-L) was placed. Two measurements were taken (CSA and center of mass) to calculate volume. Mechanically stretching the CB-Z-L increased the equatorial length and decreased the A-P length, CSA, and lens volume. The control parameters were restored when the lenses were stretched and relaxed in an aqueous physiological solution, but not when submerged in oil, a condition with which fluid leaves the lens and does not reenter. This suggests that changes in lens CSA previously observed in humans could have resulted from fluid movement out of the lens. Thus accommodation may involve changes not only in capsular surface but also in volume. Furthermore, we calculated theoretical volume changes during accommodation in models of human lenses using published structural parameters. In conclusion, we suggest that impediments to fluid flow between the aquaporin-rich lens fibers and the lens surface could contribute to the aging-related loss of accommodative power.

scholarly journals THE ANTERIOR LENS SURFACE

1914 ◽  
Vol 7 (5) ◽  
pp. 418-419
Author(s):  
U. S. BIRD
Keyword(s):  
Lens Surface

Aspheric Lens Decenter Measurement

2007 ◽  
pp. 241-244
Author(s):  
Jets Chang ◽  
Bi-Hui Hu ◽  
Warren Tsai ◽  
Leon Li ◽  
Patrick Chang
Keyword(s):  
Aspheric Lens
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