Results 231 to 240 of about 38,101 (289)

Rigid Gas Permeable Contact Lenses in Hyperbaric Environments

Optometry and Vision Science, 1988
We studied the wearing of hard gas permeable contact lenses during decompression in a hyperbaric environment. Twenty-four exposures of three different lens materials were carried out in a hyperbaric chamber. The dry air dive profiles were: 45.72 m (150 ft) for 30 min and 15 min; 22.86 m (75 ft) for 15 min; and 11.43 m (37.5 ft) for 15 min.
J F, Socks, J F, Molinari, J L, Rowey
openaire   +2 more sources

Success of Rigid Gas Permeable Contact Lens Fitting

Eye & Contact Lens: Science & Clinical Practice, 2017
Objectives: To assess the percentage of successful rigid gas permeable (GP) contact lenses (CLs) fit for both refractive and therapeutic reasons. Methods: New CLs (soft or GP) fittings were retrospectively analyzed and divided into refractive and therapeutic prescriptions.
Sara, Ortiz-Toquero, Mario, Martin, Guadalupe, Rodriguez, Victoria, de Juan, Raul, Martin   +4 more
openaire   +2 more sources

Rigid gas permeable contact lens and corneal topography

Ophthalmic and Physiological Optics, 2001
SummaryWe investigated the effect of high Dk daily wear rigid gas permeable contact lenses on corneal topography. Eight young myopic subjects wore hard contact lenses for 21 days. Corneal topography was monitored using the EyeSys system. It was measured every day during the next 21 days after the fitting.
E, Yebra-Pimentel, M J, Giráldez, F L, Arias, J, González, J M, González, M A, Parafita, M, Febrero   +6 more
openaire   +2 more sources

Rigid gas permeable lens identification using refractometry

International Contact Lens Clinic, 1992
Abstract A plentitude of rigid gas permeable lenses have become available to the contact lens practitioner. The materials vary in monomer compounds that produce specific optical polymers, refractive indices, specific gravities, and oxygen permeabilities as well as unique wetting characteristics.
Neil R. Hodur, Janice Jurkus, Gary Gunderson   +2 more
openaire   +1 more source

Gas Permeability of Rigid Fibrous Refractory Insulations

Journal of Thermophysics and Heat Transfer, 1998
Rigid fibrous refractory insulations (TPS tiles) are integral components of many spacecraft thermal protection systems. These materials are composed of refractory fibers With diameters on the order of 1 to 15 micrometers. They are lightweight and have an open, highly porous microstructure. Typical densities are less than 500 kilograms per cubic meters,
Jochen Marschall, Frank S. Milos
openaire   +1 more source

Rigid gas permeable extended wear.

The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc, 1994
We have reviewed the pertinent literature on rigid gas permeable (RGP) extended wear contact lenses, and we discuss the benefits and adverse reactions of this contact lens modality, drawing conclusions from reviewed studies. We suggest parameters for success with these lenses and guidelines for the prevention of adverse reactions.
J R, Maehara, P R, Kastl
openaire   +1 more source

Rigid gas-permeable lens problem solving.

Journal of the American Optometric Association, 1986
The introduction of high oxygen-permeable rigid lenses for daily wear has provided practitioners with an excellent alternative to other available lens materials. However, compromise in material properties may, in fact, result in lens-induced complications.
E S, Bennett, D J, Egan
openaire   +1 more source

Correction of astigmatism with rigid gas permeable lenses

Ophthalmology Clinics of North America, 2003
Comparison of the results of keratometry and refraction usually suggests the appropriate contact lens for a patient's eye. Specialized rigid toric contact lenses include bitoric and back toric RGP lenses, front toric RGP lenses, and bitoric RGP lenses with prism ballast. Each lens has specific indications.
openaire   +2 more sources

Rigid Gas-Permeable Extended Wear: A Comparative Clinical Study

Optometry and Vision Science, 1992
A 12-month clinical trial involving 88 subjects was undertaken to compare the clinical performance of rigid gas-permeable contact lens extended wear (EWRGP) with that of RGP daily wear (DWRGP) lenses and soft lens extended wear (SLEW) with medium water content lenses. Withdrawals from the EWRGP group tended to result from lens-related problems, whereas
G, Young, M, Port
openaire   +2 more sources

Bevel toric multicurve rigid gas-permeable lens for keratoconus

Japanese Journal of Ophthalmology, 2012
To evaluate the efficacy and safety of Twinbel bevel toric, a newly designed rigid gas-permeable (RGP) lens with a toric bevel curvature, for keratoconus.A retrospective analysis of nine eyes of patients with keratoconus who had been wearing RGP contact lenses and were switched to Twinbel bevel toric at Yamaguchi University Hospital.
Ryoji, Yanai, Kiichi, Ueda, Koh-Hei, Sonoda   +2 more
openaire   +2 more sources