Glasses Tech – Prescription Glasses, Prescription Eyeglasses

February 12, 2011

Visual Improvements With Red-Tinted Glasses in a Patient With Cone Dystrophy

Filed under: Glasses 1982 — admin @ 2:39 am

Eyeglasses

A patient with cone dystrophy empirically discovered that his vision improved when a red filter was placed in front of his eyes. The present study documents the conditions under which his visual acuity and field improved and shows that the patient’s vision is mediated by the night vision photoreceptors, the rods. Increment threshold functions examined the benefits (and limitations) of red glasses to the patient’s vision. (more…)

Attitudes of Students, Parents, and Teachers Toward Glasses Use in Rural China

Filed under: Glasses 2010 — admin @ 2:30 am

Objective To use focus groups to understand barriers to glasses use among children in rural China.

Methods Separate focus groups were conducted between December 17, 2007, and August 5, 2008, for the following 3 groups at each of 3 schools in rural China: children aged 14 to 18 years with myopia of less than –0.5 diopters in both eyes, those children’s parents, and those children’s teachers. Participants were also asked to rank their responses to questions about glasses use. The focus group transcripts were coded independently by 2 investigators using qualitative data management software. (more…)

Through a Yellow Glass Darkly

Filed under: Glasses 2007 — admin @ 2:26 am

The patient (A.S.) underwent an uncomplicated cataract extraction on December 27, 2006. The first postoperative visit, exactly 24 hours later, revealed uncorrected visual acuity in the operated eye of 20/15 minus. The surgeon (W.J.S.), by that time tending to his grandchildren in Sarasota, Fla, called with his congratulations.

Six hours later, the patient noted that vision in the operated eye remained clear but that the brightness had declined by several log units and everything was a deep, dark yellow, as if looking through a very dark yellow filter. He nonetheless sat through 2 hours of The History Boys. (more…)

Liquid Crystal Glasses: Feasibility and Safety of a New Modality for Treating Amblyopia

Filed under: Glasses 2007 — admin @ 2:25 am

Amblyopia is the most common cause of monocular visual impairment.1-2 Strabismus and anisometropia occurring during childhood are risk factors for amblyopia leading to various levels of poor vision and different responses to currently available treatments.3-5

To overcome the unknown factor of a child’s compliance, avoid the blemish of a mechanical patch, and enhance the child’s willingness to undergo the antiamblyopic regimen, electronically controlled liquid crystal glasses have been developed. Application of a small electric charge changes the spatial orientation of the suspended crystal molecules within the glasses. (more…)

Nonlinear Optical Properties in Bi2O3-B2O3-SiO2 Glasses

Filed under: Glasses 2007 — admin @ 2:16 am

Abstract:A series of bismuth borate silica glasses were prepared and their densities, linear refractive indices and transmission spectra were measured. The optical gaps Eopt were obtained from the extrapolation of the linear portions to zero absorption. A decrease in the value of Eopt with increasing bismuth content may be explained by suggesting that the non-bridging oxygen ion content increases .It was found that high refractive index and narrow bandgap could lead into high third-order optical nonlinearity. (more…)

November 9, 2010

Liquid Crystal Glasses: Feasibility and Safety of a New Modality for Treating Amblyopia

Filed under: Glasses 2006 — admin @ 3:34 am

Amblyopia is the most common cause of monocular visual impairment.1-2 Strabismus and anisometropia occurring during childhood are risk factors for amblyopia leading to various levels of poor vision and different responses to currently available treatments.3-5
(more…)

Attitudes of Students, Parents, and Teachers Toward Glasses Use in Rural China

Filed under: Glasses 2006 — admin @ 2:50 am

Objective To use focus groups to understand barriers to glasses use among children in rural China.

Methods Separate focus groups were conducted between December 17, 2007, and August 5, 2008, for the following 3 groups at each of 3 schools in rural China: children aged 14 to 18 years with myopia of less than –0.5 diopters in both eyes, those children’s parents, and those children’s teachers. Participants were also asked to rank their responses to questions about glasses use. The focus group transcripts were coded independently by 2 investigators using qualitative data management software. (more…)

March 8, 2010

The Fine Art of Prescribing Glasses: Without Making a Spectacle of Yourself, Third Edition

Filed under: Glasses 2005 — admin @ 9:56 am

Once again, Drs Milder and Rubin have provided an invaluable text for all who deal with refractive correction of the eye. The Fine Art of Prescribing Glasses: Without Making a Spectacle of Yourself, Third Edition, has been thoughtfully updated and revised by the authors.

The text’s 22 chapters thoroughly cover the necessary subjects that allow ophthalmologists and optometrists to excel in refractions and in prescribing lenses. Throughout this book, case examples and discussions illustrate and emphasize important points. (more…)

THE STRUCTURE OF LITHIUM-CONTAINING SILICATE AND GERMANATE GLASSES

Filed under: Glasses 2005 — admin @ 9:54 am

The addition of alkali oxides to silicate glasses results in the disruption of the silicate network and the formation of non-bridging oxygen atoms and Qn species. Lithium-containing silicate glasses behave differently than other alkali-containing silicate glasses. (more…)

Structural Relaxation of Polymer Glasses at Surfaces, Interfaces, and In Between

Filed under: Glasses 2005 — admin @ 9:53 am

We analyzed the glassy-state structural relaxation of polymers near surfaces and interfaces by monitoring fluorescence in multilayer films. Relative to that of bulk, the rate of structural relaxation of poly(methyl methacrylate) is reduced by a factor of 2 at a free surface and by a factor of 15 at a silica substrate interface; the latter exhibits a nearly complete arresting of relaxation. (more…)

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Glasses Tech – Prescription Glasses, Prescription Eyeglasses