Conjunctivitis is a common and uncomfortable eye condition that can be caused by infections, allergies or irritants. The conjunctiva is thin clear tissue covering the front of the eye. One or both eyes may be affected, and the condition can spread from one to the other.
I'm assuming that by America you mean The United States. There's no country called America. Even when excluding Taiwan and other disputed territories, China is larger than the United States, both in terms of land area, and in terms of land area including inland waterbodies. By land area only: China: 9,326,410 sq km. United States: 9,161,966 sq km, 1.8% smaller than China.
However, by 2050, China is projected to have surpassed the U.S. with a larger proportion of its population 65 and older (26.8 percent versus 20.9 percent). Although a larger proportion of the U.S. population is currently in the older ages, China and India have much larger populations overall, including 65 and over. In 2012, China had 122 million and India had 67 million people 65 and over, compared with 43 million in the United States.