Chicago-based medical imaging software vendor Merge Healthcare will enter the ophthalmology imaging arena after signing a definitive agreement to acquire Ophthalmic Imaging Systems of Sacramento, Calif.

Under the acquisition terms, Merge will pay $1 per share for OIS stock, or about $30.3 million. The stock trades on the Over-the-Counter Bulletin Board and closed June 3 at 85 cents per share.

Shareholders representing 72 percent of OIS' outstanding shares have agreed to support the sale, which the companies expect to close during the third quarter. Merge already serves the radiology, cardiology, orthopaedics and clinical trials markets.

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