Huang and his colleagues already knew that certain striped patterns can trigger migraines in some people.
They tested 11 people with migraines and 11 without. The researchers made lenses known as precision ophthalmic tints for each person. They also made two other pairs of lenses, gray and colored, as comparisons.
Next, the participants were placed in a functional MRI machine and exposed to a range of striped patterns with different likelihoods of triggering distortion and discomfort.
Patients reported some relief with all the lenses, but the precision ones worked better.
''Wearing the control lenses reduced the degree of visual discomfort by about 40% compared to that without lenses, and wearing the precision ophthalmic tints resulted in a 70% reduction," Huang says.
The precision lenses suppressed brain activation in those with migraines.
Both the migraine and migraine-free patients responded in a similar way to the non-stressful striped patterns.
"It shows that although wearing sunglasses could help those with migraine to reduce visual stress, wearing individually prescribed POTs [precision ophthalmic tints] may further reduce the visual stress significantly in comparison to that with wearing the sunglasses," Huang says.
While the visual stress for the study was produced by an experimental stimulus in the study, Huang says it can also result from such activities as reading, watching TV, or working on the computer.
The precision lenses can be put into regular glasses, Huang says. For the study, Cerium Visual Technologies, Ltd, in the U.K. provided the lenses.
Huang's co-researcher, Arnold Wilkins, designed the Intuitive Colorimeter, the device used in the study to evaluate the best hue of light for visual comfort. He receives from the UK Medical Research Council a portion of royalties on sales of the colorimeter but not on the lenses sold.