Singapore headquartered global investor Temasek has acquired a minority stake in Dr Agarwal's eye care hospital chain as the Indian group Wednesday unveiled an ambitious expansion plan to double its number of hospitals from 76 to 150 in five years. Chairman of Dr Agarwal's Group of Eye Hospitals, Amar Agarwal, told reporters that the chain has raised Rs 270 crore investment from Temasek which has acquired a minority stake in the hospital chain. He, however, did not outline the nitty gritty of share pattern following the investment.