Results 171 to 180 of about 126,096 (212)

Horizontal and anterior chamber diameter for phakic intraocular lens sizing

Australasian journal of optometry, The, 2021
Proper selection of phakic intraocular lens diameter is necessary to avoid complications related with excessive vaulting after its implantation.Horizontal corneal diameter, measured as white-to-white distance, is one of the parameters used for phakic intraocular lens diameter calculation.
Adam Oleszko
exaly   +3 more sources

Treatment of corneal dellen with a large diameter soft contact lens

Contact Lens and Anterior Eye, 2011
A 58-year-old man presented with corneal dellen twelve days after pterygium removal on his left eye. Initial treatment with lubrication and artificial tears was unsuccessful. The fitting of a conventional contact lens was not possible because of conjuctival chemosis. Additionally the patient denied eye patching due to professional reasons.
George D Kymionis, Georgios A Kontadakis
exaly   +3 more sources

Evaluation of the relationship between corneal diameter and lens diameter

Journal of Cataract and Refractive Surgery, 2008
To investigate the relationship between corneal diameter (white to white) (WTW) and the dimensions of the crystalline lens.Private practice, Cincinnati, Ohio, USA.Human cadaver eyes were oriented to allow caliper measurements of the horizontal and vertical corneal diameters (WTW).
Christopher, Khng, Robert H, Osher
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

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

Tear mixing under a soft contact lens: effects of lens diameter

American Journal of Ophthalmology, 1999
Tear exchange under a soft contact lens is modest, and higher exchange rates may be necessary to reduce extended-wear complications; what is not known is the optimal soft lens design to increase tear mixing. We explored the effect of lens diameter on tear mixing.Twenty-three subjects wore four different soft contact lenses with diameters of 12.0, 12.5,
N A, McNamara, K A, Polse, R J, Brand, A D, Graham, J S, Chan, C D, McKenney   +5 more
openaire   +2 more sources

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.
J K, Storey, E P, Rabie
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

A method to fabricate micro lens array with different diameters

2011 6th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, 2011
Micro lens arrays are applied to several areas, such as imaging reconstruction and organic light emitting diode light extraction. Researchers have studied on how to increase the efficiency of luminous current and luminous power of an organic light-emitting device (OLED) [1] by using several spheres with different diameters.
Sheng-Yuan Feng, Hsin-Ta Hsieh, Guo-Dung John Su   +2 more
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