background: adverse effect of sun rays mainly uv ray on the human eye documented and protection of eyes is necessary using different methods such as, sun glasses. sunglasses are designed in different colors. the aim of this study was evaluation of the effect of different colors of sunglasses on the visual acuity, contrast sensitivity, stereopsis and color vision. methods: 81 normal subjects wer...

Recognizing 3-colorable graphs is one of the most famous NP-complete problems [Garey, Johnson, and Stockmeyer STOC’74]. The problem of coloring 3-colorable graphs in polynomial time with as few colors as possible has been intensively studied: O(n1/2) colors [Wigderson STOC’82], Õ(n2/5) colors [Blum STOC’89], Õ(n3/8) colors [Blum FOCS’90], O(n1/4) colors [Karger, Motwani, Sudan FOCS’94], Õ(n3/14...

Eye movements were monitored to examine search efficiency and infer how color is mentally represented to guide search for multiple targets. Observers located a single color target very efficiently by fixating colors similar to the target. However, simultaneous search for 2 colors produced a dual-target cost. In addition, as the similarity between the 2 target colors decreased, search efficiency...

background & objectives: oral submucous fibrosis (osmf) is a condition where excessive deposition of dense collagen fibers occurred in the connective tissue of oral mucosa. an alteration of collagen necessitates an in depth understanding of collagen in oral tissues as no breakthrough studies have been reported. therefore the aim was to correlate the clinical, functional and histopathologica...

Memory colors refer to those colors recalled in association with familiar objects. While some previous work introduces this concept to assist digital image enhancement, their basis, i.e., on-screen memory colors, are not appropriately investigated. In addition, the resulting adjustment methods developed are not evaluated from a perceptual view of point. In this paper, we first perform a context...