What is sensitivity to contrast?

contrast sensitivity is part of a human vision that includes the ability to distinguish between different levels of brightness. The degree is a degree of brightness and when people have low sensitivity to contrast, they can disrupt their vision. They may have difficulty visiting street lighting, watching objects at night, reading or watching movies and television. There are a number of conditions that can lead to low sensitivity, including macular degeneration and diabetes. Aging is also a factor, because people naturally lose sensitivity to contrast with age, from about 20 years, when it tends to culminate. It is important to note that patients may have 20/20 vision and still have a very low sensitivity to contrast, which affects their functional vision. The physician may perform a test in response to patient complaints or abnormalities observed during routine eye tests and testing. Some ophthalmologists managed drought automatically tests to all their patients in the physical test.

In the contrast sensitivity test, the patient will show a number of graphs that show black, white and gray lines and dots on different backgrounds. These graphs are viewed using corrective devices such as glasses or contacts. Most people have the highest level of contrast sensitivity with medium objects and a high level of contrast. As objects increase and reduce at low contrast levels, it is more difficult to recognize them. People with a high level of contrast sensitivity can be able to recognize most of the objects on the graph, while people who have low contrast sensitivity will have trouble.

The common contrast sensitivity test includes a graph that shows lines of different widths along the horizontal axis and sets the contrast along the vertical axis. While all lines are the same lengths, in the middle of the chart it appears longer because the width makes it easier to make the ease of distinction, even if there is no great contrast.

In addition to being important for visual health, sensitivity to contrast dAn important problem for graphic designers. Designers have to think about how readable images will be and must propose with regard to the limitation of the human eye. For example, the Internet is an important problem with color text and the background includes the use of a wide -changing luminaire to ensure that users are able to read the text conveniently.