Some people believe that having normal vision is mainly due to the anatomical characteristics of the eye, but according to a new study, tiny eye movements can also play a big role in it, and these findings may lead to new treatments for patients with poor vision, according tomedia.
For some time now, scientists have been aware of a person’s constant, unconscious, tiny movement of the eye, which is called eye-gazing. Because these movements are so small, people don’t even realize they’re happening.
Until then, people thought they didn’t play an important role in how people see the world. However, recent studies have found that by moving images around the retina, these movements reveal more retinal photosensitive cells. The theory is that the result is that the brain is better able to “see” what the eyes are looking at.
Led by Professor Michele Rucci and graduate student Janis Intoy, researchers at the University of Rochester decided to test the theory. At first, they asked a group of volunteers with 20/20 (normal) vision to watch a standard Snellen vision table displayed on a video screen.
When the test looked at the chart at a distance of 20 feet (6 meters), the letters that were able to accurately identify at least the eighth line reached the 20/20 standard.
In the second round of tests, however, the chart moved slightly across the screen, automatically compensating the participants for eye movement in real time. This means that the image of the chart is exposed to fewer retinal receptor cells. Therefore, the test subject (average) can only read the sixth line, indicating that the vision test score is 20/30 below the standard.
Rucci points out that vision reaching 20/20 benefits not only from good optics and a healthy retina but also from fine motion control, and that “vision impairment may be due to eye movement, a factor that is not currently monitored at all.” “