Since the Oculus Rift first made strides with its successful Kickstarter campaign, there has been an influx of gaming developers trying to apply virtual reality's prospects to real-world problems.

Diplopia is one such virtual reality game from San Francisco. The game, which is still in beta testing, is designed to help people with lazy eye (amblyopia) and crossed eye (strabismus). It recently closed a $700,000 seed round, led by SOS Ventures.

While many will tell you that playing video games are bad for your eyes, the founder, James Blaha, fixed his own lazy eye with the game he invented with Manish Gupta.

Already, they have over 300 beta testers around the world—many of which are using the Diplopia software under the direction of their eye doctor.

"It's a strange experience for the world to appear more real and to have your vision change in such a big way," says Blaha, who was born with lazy eye and lived his life in a flat world, seeing only in two dimensions. He was told the condition was irreversible, until he developed a video game to strengthen his weaker eye with Oculus Rift.

Until now, conventional therapy often relies on patching the dominant eye to increase the vision of the weak eye, but many times patients regress when patching is discontinued and may remain stereo-blind, or the inability to see in 3-D.

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"Diplopia's approach is therapy with both eyes opened, which allows patients to gain binocular vision while increasing their acuity of the amblyopic eye," said Dr. Tuan Tran, Diplopia's advising doctor, who is currently coordinating a pilot study at Michigan College of Optometry. He added, "some people will experience 3-D for the first time after using Diplopia after the first time."

The virtual reality game allows doctors to control what the patient sees on each screen and trains those with crossed-eye problems to coordinate their eyes by manipulating contrast; players score well when their brain merges two images into a complete scene.