Eye 'Training' May Help Restore Some Vision Lost to Glaucoma04/22/14
TUESDAY, April 22, 2014 (HealthDay News) -- A new computerized
eye-training program could upend the long-held belief that
glaucoma-related vision loss is irreversible, a small study
Daily "vision workouts" restored a significant degree of sight
to a group of glaucoma patients by taking advantage of the brain's
talent for learning new tricks, researchers said.
"Glaucoma is a disease that slowly, over the course of years, damages the retina and optic nerve in the eye," said study lead author Bernhard Sabel, director of the Institute of Medical Psychology at the Otto-von-Guericke University of Magdeburg in Germany.
"When tissue is damaged, vision impairments are the consequence," he added. Until now, vision loss was considered permanent. "All that could be done was to halt further progression," he said.
Generally, vision loss from glaucoma begins with peripheral or
side vision, leading to what are called visual field defects.
Untreated, glaucoma can lead to blindness.
The research team's computerized vision workout improved these
visual field defects by upwards of 20 percent in a matter of
months, the scientists reported in the April issue of
Between 2004 and 2007, the investigators analyzed the vision
capacity of 30 male and female glaucoma patients between the ages
of 39 and 79.
Almost all had glaucoma in both eyes. Damage to critical
ganglion cells in the retinal region of each eye varied from mild
to severe, as did related vision loss.
Patients were randomly split into two groups of equal size. For
three months, one group received computerized "vision restoration
training" twice daily, six days a week, for 30 minutes each, with
training focused on the eye with poorer vision.
The sessions linked to vision gains involved tracking light dots
on a dark screen as they moved about in a controlled fashion
designed to stimulate peripheral vision centers damaged by disease.
Throughout the study, the difficulty of each session was adjusted
based on each patient's progress.
By contrast, the second group participated in computerized
sessions that only asked them to identify the up/down and
right/left orientation of on-screen objects. These objects were
strategically placed to stimulate only central vision centers not
damaged by disease.
The result: By all measures of visual detection sensitivity, the
ability to see the spots went up markedly among the vision
restoration training group.
Sabel noted that visual cue reaction times sped up from 580
milliseconds to 540 milliseconds among the training group. And the
ability to properly detect visual stimuli went from a pre-training
level of 37 percent to 44 percent.
"Training strengthens brain connections that are still surviving after the damage," Sabel said, explaining that the workouts improve the efficiency of neurological pathways critical to vision. This means that although an eye damaged by glaucoma will send less visual information to the brain, the brain will be better able to interpret and enhance what it receives.
Sabel cautioned, however, that the training will not prove
helpful to all glaucoma patients.
"Patients with little vision or none are not suited," he noted. "But the majority of patients do not have such severe deficits, so almost all would be eligible."
Dr. Alfred Sommer, professor of ophthalmology at Johns Hopkins
University School of Medicine in Baltimore, cautioned against
overhyping the findings.
"[While] it may be that these results were 'real,' it is also possible that the form of training the patients received was so similar to the actual test procedure they used to judge the response, that all they really accomplished was to train the patients to be better 'testers,' " he said.
Patients shouldn't think their glaucoma will be cured, Sommer
said. "It is important to understand that even if these results do
demonstrate an improvement in sensitivity to light seen and
processed by cells and neural connections that don't usually
respond to them, it is not bringing dead cells and nerve fibers
back to life," Sommer stressed. "Nor is it improving a patient's
ability to see under normal, day to day circumstances."
The key to controlling glaucoma, he added, "remains early
detection by an ophthalmologist with immediate intervention and
long-term follow-up, to try to protect and retain the remaining
For more about glaucoma, visit the
U.S. National Eye Institute.
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