Psoriasis can affect the nails and produces a variety of changes in the appearance of finger and toe nails. Nail psoriasis occurs in 40â45% of people with psoriasis affecting the skin and has a lifetime incidence of 80â90% in those with psoriatic arthritis.
Color & Vision Matters. The human eye can see 7,000,000 colors. Some of these are eyesores. Certain colors and color relationships can be eye irritants, cause headaches, and wreak havoc with human vision. Other colors and color combinations are soothing. Consequently, the appropriate use of color can maximize productivity, minimize visual fatigue, and relax the whole body.
Human eyes contain three 'cones' that can distinguish between red, blue, yellow and green light making it possible to see the full colour spectrum, left. Dogs only have two cones, meaning they can't distinguish between red and green and see colours on a blue and yellow scale, right. It only took three trials for the dogs to learn which colour paper was sat in front of the box containing the raw meat.