Science & Technology

The little moment of “blindness” is the key to your vision

Researchers have discovered new information about the role of small “fixed” eye movements to make us clearly visible.

Fixed eye movement is a small movement of the eye. Therefore, we humans are unaware of them. Still, they play a major role in the ability to see letters, numbers, and objects from a distance.

“… Microsaccades are accompanied by a short period of visual suppression in which we are essentially blind.”

By studying how a type of fixation eye movement, called a microsaccade, affects the fossa, a small area in the center of the retina, researchers provide important basic information that may lead to improvement. To do Treatment And treatment of eyesight Impairment..

Small but important

Foveora is small, but essential for daily tasks such as checking details, finding friends in the crowd, and reading distant road signs while driving.

However, the area is so small that you should always shift. Line of sight Allows Foveora to get a panoramic view of the world, much like rotating a telescope to get a panoramic view of the scene. But unlike rotating a telescope, our eyes do most, especially the smallest, of these line-of-sight shifts on their own, often under our consciousness.

However, eye movement is important for vision. According to Janice Intoy, a postdoctoral fellow in the laboratory of Michelle Lucci, a professor of brain and cognitive science at the University of Rochester. “How well you look at all the time is closely related to when and how you shift. Line of sight.. “

Researchers focused on microsaccades. This is a small, rapid gaze movement that often occurs when examining details. It has long been known that vision is temporarily impaired during the large eye movements we perceive, for example, moving back and forth between two computer screens.

This phenomenon of temporary loss of vision is known as impulsive motor suppression. However, until now, it was unclear whether suppression would occur during microsaccades and whether it would affect fossa visibility.

Lucci said: “Our lab has high-resolution tools for studying vision on this small scale, but other studies have historically focused on areas around the eye that do not require such precision and precision. I guessed. “

Period of blindness

Researchers record a microsaccade of a human observer engaged in a computer task, searching on-screen for “fleas” that jump into patches of “fur”, a task similar to primate social grooming. Did.

What the researchers found was amazing.

Immediately before and after the participants’ eyes changed, I couldn’t see the fleas even if I looked directly at them.

“We have observed that microsaccades are accompanied by short-term visual depression, which we are essentially blind,” says Intoy.

However, researchers found that after the saccade, overall visual acuity was temporarily enhanced in this area as the line of sight recovered rapidly at the center of the line of sight and continued to improve.

“Our results show that the center of gaze undergoes dramatic and rapid modulation with each of us. redirect “Our line of sight,” says Intoy. “This brief loss of vision can occur because the image of the world changes invisible each time you move your eyes. By suppressing perception during saccades, I Our visual system can create a stable perception. “

Future studies will elaborate on this phenomenon and how humans control eye movements to balance impulsive movement suppression with subsequent visual enhancement.

The dissertation will be displayed in Minutes of the National Academy of Sciences..

sauce: University of Rochester

The little moment of “blindness” is the key to your vision The little moment of “blindness” is the key to your vision

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