purpose: to compare aspheric and spherical hydrophilic intraocular lenses (iols) in terms of contrast sensitivity and visual acuity in photopic and mesopic conditions. methods: this triple-blind randomized clinical trial was performed on 40 eyes of 40 patients at al-zahra eye center, zahedan, iran. the eyes were randomized to standard phacoemulsification procedure with spherical (adapt, b&l;) o...

background: contrast induced nephropathy (cin) is one of the most common complications after radiographic procedures using intravascular radiocontrast media. the aim of the current study was to assess the effect of atorvastatin on prevention of cin in patients undergoing coronary angiography. materials and methods: in a clinical trial study, 200 patients referred for angiography were randomly d...

Research has shown that the visual system's sensitivity to variations in luminance (visual contrast) within a particular area of the retina is affected in a bottom-up fashion by the ambient contrast levels in nearby regions. Specifically, changes in the ambient contrast in areas surrounding the target area alter the sensitivity to visual contrast within the target area. More recent research has...