Results 261 to 270 of about 376,107 (295)

ULTRASONIC MEASUREMENT OF TRANSVERSE LENS DIAMETER DURING ACCOMMODATION

Ophthalmic and Physiological Optics, 1985
Abstract— A new method is introduced which makes possible in vivo measurement of transverse lens diameter (T.L.D.) with ultrasound. The horizontal T.L.D. was measured for 7 nearly emmetropic subjects at accommodation stimulus levels of 0,2,4,6 and 8 dioptres. The unaccommodated T.L.D. was found to be proportional to the axial length.
J K, Storey, E P, Rabie
openaire   +3 more sources

Refractive bifocal intraocular lens and pupillary diameter

Journal of Cataract and Refractive Surgery, 1992
To assess the relationship between pupillary diameter and focusing for distance and near vision with the refractive bifocal intraocular lens (IOL), we studied visual acuity for far and near distance, near point, and depth of focus with normal pupillary movements and after pharmacological miosis and mydriasis (pilocarpine 2% and phenylephrine 10 ...
G, Ravalico, F, Baccara, A, Bellavitis
openaire   +2 more sources

The Effect of Temperature on Soft Contact Lens Diameter

Eye & Contact Lens: Science & Clinical Practice, 2016
Purpose: The diameters of soft contact lenses are conventionally measured at room temperature (RT), however, all soft lenses shrink when raised to eye temperature (ET). The purpose of this study was to evaluate RT to ET shrinkage in a representative sample of contemporary spherical soft contact lenses.
Graeme, Young, Matthew, Potts, Anna, Sulley   +2 more
openaire   +2 more sources

The measurement of rigid contact lens diameters

Journal of The British Contact Lens Association, 1987
Abstract Four methods of measuring rigid contact lens diameters were investigated. A calibration method is described. Ahigh quality V-slot gauge was found to be the most effective method of measuring lens diameters and the band magnifier the least. A tolerance on lens diameter of less than 0.1mm appears to be impractical.
openaire   +1 more source

In vivo increase of the human lens equatorial diameter during accommodation

American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1996
The movement of the human lens equator during accommodation was examined in vivo. High-resolution ultrasound images of the lens equator were obtained from young human subjects whose amplitude of accommodation was controlled with 1% tropicamide and 2% pilocarpine.
R A, Schachar, C, Tello, D P, Cudmore, J M, Liebmann, T D, Black, R, Ritch   +5 more
openaire   +2 more sources

High NA Aspheric Fizeau Lens with Large Aperture Diameter

Optical Design and Fabrication 2017 (Freeform, IODC, OFT), 2017
An aspheric design of a high NA Fizeau lens is introduced, which has many advantages in comparison to a common spherical design. Additionally, measurement results of the lenses and the objectives are presented.
A. Möhl, S. Wickenhagen, U. Fuchs
openaire   +1 more source

High-capacity wavelength demultiplexer with a large-diameter GRIN rod lens

Applied Optics, 1982
A high capacity (twelve-channel) fiber optic wavelength demultiplexer incorporating a large diameter GRIN rod lens and grating was developed and fully characterized. The demultiplexer operates over the 740-930-nm wavelength range with an average channel spacing of 17 nm.
B D, Metcalf, J F, Providakes
openaire   +2 more sources

The Effect of Temperature on Soft Contact Lens Modulus and Diameter

Eye & Contact Lens: Science & Clinical Practice, 2011
To examine the relative changes in diameter and modulus of soft contact lenses when the temperature is raised from room temperature (RT) to eye temperature (ET).Thirteen lens types including 9 silicone hydrogel lenses were measured for diameter and elastic modulus at RT (20 ± 1°C) and ET (34 ± 1°C).
Graeme, Young, Renee, Garofalo, Shaun, Peters, Oliver, Harmer   +3 more
openaire   +2 more sources

Uniocular Conjunctivochalasis and larger diameter PROSE lens

Clinical and Experimental Optometry, 2021
Sona, Paul, Bhaskar, Srinivasan, Geetha K, Iyer   +2 more
openaire   +2 more sources

An Inexpensive Energy Filter Lens for Large Diameter Electron Beams

Review of Scientific Instruments, 1971
The theory behind the use of a rotationally symmetric hyperbolic electrostatic field as an energy filter lens for electrons is discussed. The design of such a lens for use in eliminating inelastically scattered electrons from the output beam in a low energy electron scattering experiment is described.
H. D. Zeman, K. Jost, S. Gilad
openaire   +1 more source