A new concept of the LCD light-switching optical filter allowing for very high, electrically controlled, continuously variable light attenuation (up to 100.000) optimized / symmetrized for the light incidence along the normal to the LCD plane is proposed. The new LCD light-switching optical filter also exhibits very low light attenuation dependence for the oblique incidence of light within a limited cone of angles off the normal incidence direction in compliance with the international safety and quality regulation EN 379 for personal protection equipment. According to the invention the problem is solved by specific, novel modification of the general principle of highly twisted nematic LCDs, allowing for the adaptation of the light transmission / driving voltage characteristics to specific requirements of the driving electronics as well as “symmetrizing” the overall optical birefringent properties, which in turn results in a high degree of their angular compensation. _____ In 2012 this patent was amended by a new "Continuation in part Patent" US2012002121 (A1) with the same title extending the patent protection to the use of the negative c-plate birefringent compensation film, exhibiting additional small a-plate positive birefringence. Novel, important upgrade of the already granted patent has been developed. It is based on a novel/ proprietary orientation of the intrinsic positive inplane (a-plate)birefringence of otherwise negativebirefringent (negative C-plate)compensation layer. This novel technical solution improves for almost a factor of 2 the efficiency of angular compensation by means of the negative c-platecompensation layer, already covered by the granted US patent 8,026,998 (Continuation in part patent application with USPTO # 13/208,378
COBISS.SI-ID: 19329831
This prospective follow-up study evaluated the longer term changes to macular thickness and volume following cataract surgery. The study included 23 patients (23 eyes) who underwent ambulatory cataract surgery with phacoemulsification and intraocular lens implantation, followed by a scheduled optical coherence tomography measurement of macular thickness and volume after 3 months. Results were compared with preoperative data and measurements taken at 1 month after surgery, which were recorded in a previous study. A comparison of preoperative macular thickness values with those at 3 months after surgery demonstrated that the latter values remained greater in all macular regions except the superior outer macula, and that the differences were significant in the fovea, nasal inner macula and inferior outer macula. When macular thickness at 3 months after surgery was compared with that measured at 1 month, decreases were observed in all perifoveal areas, suggesting the reversible nature of cataract surgery-related macular thickness changes.
COBISS.SI-ID: 3998527