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…)
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…)
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…)