Sci Rep: A way to relieve side effects of one-sided vision correction

2, 2020 /--- as people get older, their ability to focus decreases.
, led by Pennsylvania psychologist and neuroscientist Johnhannes Burge, found that one-sided vision correction is a common treatment against this deterioration.
, however, the researchers hope to find a better, safer solution to the side effects of the method, such as visual errors.
(Photo Source: www.pixabay.com) One-sided vision correction (monovision) refers to placing different lenses in each eye, one for focusing nearby and the other for focusing in the distance.
it works because it induces the brain to prioritize clearer images while suppressing blurry images.
, however, this can also cause the brain to miscalculation the depth of moving objects, a problem Burge's team calls the "reverse Pulfrich effect" because it is associated with sensory hallucinations, known as the Pulfrich effect, that were discovered 100 years ago.
, the reverse Pulfrich effect may result in a depth estimation error that may be as large as the width of the lane.
Burge and colleagues have previously shown that darkening blurry lenses can solve problems.
but they were only validated with experimental lenses.
we need to prove that this finding applies to the most common contact lenses," said Burge, a researcher at the U.S. Department of Public Security.
" results were published recently in the journal Scientific Reports.
the study, the researchers recruited four participants (two men and two women) between the ages of 25 and 30 to conduct five experiments.
questions answered in each experiment were slightly different.
the first experiment was to replicate the facts that the team had already used the experimental lenses to prove.
we have confirmed that if contact lenses introduce fuzzy differences, the illusions we have previously shown in experimental lenses will also occur," said Burge.
this is the first step.
" The second step is to answer the question: Is there any difference in the size of the image? Will the image get bigger or smaller without zooming in? "Lenses with different magnifications change blur and image magnification.
contrast, contact lenses tend to have only different degrees of blur, making them powerful tools for testing the effects of magnification on visual distortion.
that magnification has no effect on the size of the effect at all.
experiments 3 and 4 focus on coloring.
Burge said: "Blurred images process faster than sharp images, while dark images process faster than light images.
lens blur speeds up image processing.
lens darkening reduces processing speed.
if the lens is blurry, the two effects cancel each other out.
" Burge and his colleagues first tested the lenses and first blackened them.
, using some simple calculations, they predicted the colors required for each blur level.
, they verify the prediction by displaying color and blur to eliminate visual misunderstandings.
last experiment looked at what happens when magnifications are used alone.
just to rule out the possibility that magnification itself affects processing speed, " he said.
, it doesn't make any sense at all.
" work is an important step towards developing clinically relevant solutions to address unintended adverse side effects of one-sided vision correction.
, however, there is more work to be done.
still need to understand the effects of overall light changes, such as what happens at dusk and at night.
(Bioon.com) Source: One step closer to a clinical fix for the side effects of monovision Source: Victor Rodriguez-Lopez et al. Contact lenses, the reverse Pulfrich effect, and anti-Pulfrich monovision corrections, Scientific Reports (2020). DOI: 10.1038/s41598-020-71395-y。