Kontrastkänslighetstest

Kontrastkänslighetstest is a visual assessment used to measure an individual's ability to distinguish between subtle differences in brightness or luminance. This ability is crucial for clear vision, particularly in low light conditions or when dealing with low-contrast objects. Unlike standard eye charts that test visual acuity, which focuses on the ability to see fine details at high contrast, contrast sensitivity tests evaluate how well the eye can detect variations in shading.

The test typically involves presenting a series of targets, often gratings or patterns, with varying levels of contrast. These targets are usually displayed at different spatial frequencies, meaning they have different degrees of fineness or coarseness. The patient's task is to identify the presence or orientation of these patterns. The results are then plotted on a graph, known as a contrast sensitivity function, which illustrates the individual's sensitivity across a range of spatial frequencies.

Reduced contrast sensitivity can be an early indicator of various eye conditions, including cataracts, glaucoma, diabetic retinopathy, and optic nerve disorders. It can also be affected by age, certain medications, and neurological conditions. A thorough contrast sensitivity test can provide valuable diagnostic information that complements other visual assessments, helping eye care professionals to detect and manage visual impairments more effectively.