Comparative evaluation of ultraviolet and visible light transmittance through prescriptive ophthalmic minus lenses

Wearing spectacles is the most common approach in correcting the refractive errors worldwide. Due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased. These lenses can reduce the reflections and hence increase the transmission of visible light; they can also decrease the transmission of ultraviolet rays. This study aims to compare the transmission of ultraviolet [A and B] and visible rays through coated and uncoated prescriptive ophthalmic plastic lenses. In this study, 39 minus non-photochromic multi-coated white plastic single-vision lenses; 9 similar lenses but without any coatings were assessed by spectral transmittancemeter for evaluation of the transmission of visible and ultraviolet rays. The transmission of visible light was 97.9% +/- 1.07% for coated lenses and 93.5% +/- 0.54% for lenses without coating. Ultraviolet-A transmission was 12.15% +/- 8.02% for coated lenses compared to 66.27% +/- 23.92% in lenses without coating. The transmission of ultraviolet-B rays was 1.21% +/- 0.4% and 23.0% +/- 15.97% for lenses with and without coatings, respectively. The transmission of visible light was significantly higher in multi-coated lenses compared to uncoated samples; whereas the transmissions of ultraviolet rays in multi-coated lenses were significantly lower than uncoated ones. Therefore, it is recommended that, except for particular cases, prescribed lenses be equipped with this multilayer coating

Prevalence of tick-borne relapsing fever in febrile patients suspicious for malaria admitted in Chabahar

According to unpublished reports that there have been cases of relapsing fever in the years ago. We decided to determine prevalence of ticks-born relapsing fever in Chabahar. This study conducted from March 2011 to February 2012, on all individuals suspected of malaria in Chabahar. The peripheral blood smears examined using a dark field microscope. A total of 12, 203 smears evaluated, of which, 5.7% of the patients confirmed to have malaria, but spirochetemia were not seen in any of the samples. Our study showed that TBRF is not common in Chabahar city