Contrastimittaus

Contrastimittaus, also known as contrast sensitivity, refers to the ability of the human visual system to detect differences in luminance or color between adjacent areas. It is a critical aspect of visual perception, influencing our ability to discern details and recognize objects in various lighting conditions. Contrast sensitivity is highest in the fovea, the central region of the retina, where the density of cone cells is highest. This is why we are most sensitive to detail in the center of our visual field.

Contrast sensitivity can be measured using various methods, including the use of sine wave gratings or contrast threshold functions. These measurements reveal that contrast sensitivity varies with spatial frequency, with the highest sensitivity occurring at intermediate frequencies and decreasing at both very low and very high frequencies.

Several factors can affect contrast sensitivity, including age, visual acuity, and the presence of visual impairments such as cataracts or glaucoma. Additionally, contrast sensitivity can be influenced by environmental factors such as lighting conditions and the presence of visual noise.

Contrast sensitivity is an essential component of visual function and plays a crucial role in activities such as reading, driving, and recognizing faces. Understanding and measuring contrast sensitivity can provide valuable insights into visual health and the effectiveness of visual interventions.