Nikon has agreed to acquire British retinal imaging firm Optos for $400 million as it moves into the medical sector. Nikon previously said it planned to enter the medical sector to leverage its optical technologies and the Japanese group purchasing Optos as an important step their long-term plan. Nikon’s President, Kazuo Ushida said, the company would expand the medical business further in the future. Nikon will pay a 30.5% premium to the closing price on Optos Thursday night.