What is saccades?
Saccades are rapid, ballistic eye movements that shift the point of gaze from one location to another. They are the primary way we scan the visual world — we don't move our eyes smoothly across a scene, we jump in discrete "saccades."
Key Properties
- •Speed — very fast (up to 900°/sec)
- •Ballistic — once initiated, trajectory is largely fixed
- •Suppressed vision — we are effectively "blind" during the movement
- •Precision — can be trained for stability and controllability
Why does Saccades matter?
Saccades matter because they are how we actually see detail. Only a small central area of the retina, the fovea, gives sharp vision, so the eyes jump several times per second to point it at whatever is important, such as words when reading or faces in a crowd.
During each jump, the brain partly suppresses visual input, which is why we don't notice a blur. This makes saccades a window into how the brain chooses what to look at, and they are closely tied to attention and decision-making.
How are Saccades measured?
Saccades are measured with eye-tracking, which records eye position many times per second. Infrared camera systems are the most common, while electrooculography uses electrodes near the eyes to pick up eye movement signals.
Clinicians and researchers look at speed, accuracy, timing and how well people can suppress an automatic look (the antisaccade task). Changes in these measures are studied in concussion, Parkinson's disease, and other neurological conditions. Consumer eye-tracking exists, but clinical interpretation requires specialized equipment and professional assessment.
In ONDA Life
Part 7 "Saccadic Stability" refers to the precision and controllability of eye micro-movements when scanning space. Training saccadic stability supports perceptual clarity and reduces cognitive load when processing visual information.