Other Causes Eye Color Change. If your eyes check out fine, then the cause of the color change is probably due to age. Aging is the most common cause of a change in eye color, gradually, after reaching adolescence. Most will lighten with age, but hazel (light brown or yellowish brown) or blue can darken.ye color is based on the number and color of pigment granules (Melanin) in our eyes. These granules range in color from neutral to very dark brown. The darker the pigment, the darker the eyes. And fewer granules result in lighter eyes. Conversely, more granules result in darker eyes.
Best Answer: the 'radius' of a circle is the distance from the center to the outside of the circle. anything that is in the direction from the center of the circle outward toward the circle is 'radial'. if you tie a rock to the end of a string and twirl it above yor head, the string is oriented radially. the 'tangent' of a circle is the line drawn at a 90 degree angle to the radius at any point on the circle.
Wind direction is usually expressed in terms of the direction from which it originates. For example, a northerly wind blows from the north to the south. Weather vanes pivot to indicate the direction of the wind.