Opticians say American teenagers are risking their eyesight by wearing a controversial contact lens to make their eyes look bigger.
The trend started after Lady Gaga's music video, Bad Romance, hit screens last year.
In the video, the singer's eyes have been digitally altered to make them look bigger and bolder.
But several companies making contact lenses in Asia claim to have achieved the same wide eyed look.
The product, known as 'circle lenses', covers part of the white area in the eyes to make the pupil look larger.
The lenses are illegal to sell in the US because they haven't been approved by federal health officials, but they can bought online from foreign websites.



