Value is the dimension of lightness/darkness. In terms of a spectral definition of color, value describes the overall intensity or strength of the light. If hue can be thought of as a dimension going around a wheel, then value is a linear axis running through the middle of the wheel, as seen below:
Drusen are tiny yellow or white deposits in a layer of the retina called Bruchs membrane. They are the most common early sign of dry age-related macular degeneration. Drusen are made up of lipids, a type of fatty protein. They may be the result of a failure of the eye to dispose of waste products that are produced when the photoreceptors of the eye drop off older parts of the cell. There are several types of drusen with different levels of risk.
Cone cells are responsible for our color vision, central vision and our detailed our sharp vision. As these cone cells die, colors are less vivid, detailed or sharp vision becomes blurry, and our straight ahead or central vision gets cloudy. Types of Drusen. There are two types of drusen â hard and soft. It is important to know which ones you have. Hard drusen are small and round with very sharp borders. These well defined deposits are light yellow and thought to be less harmful. They become more common with age and may or may not indicate the early development of age related macular degeneration.