Contrast sensitivity function

The contrast sensitivity function describes how well your eyes can detect objects at different levels of contrast under various lighting conditions. It measures your ability to distinguish objects from their background, especially when they are faint or similar in color and brightness. This function helps explain why you may see clearly in good light but struggle to detect low-contrast objects in dim or foggy environments. It provides a detailed profile of visual performance beyond just visual acuity, showing which contrasts and spatial details your eyes can perceive most effectively.