ㄧ般來說,年屆四十就有近半人有老花眼,未滿而接近四十歲當然也可能有老花眼,只是比例較低。
http://www.firstgroup.com.tw/oldtest.htm
http://zh.wikipedia.org/wiki/%E8%80%81%E8%8A%B1
http://www.uic.edu/com/eye/LearningAboutVision/EyeFacts/Presbyopia.shtml
When does Presbyopia start?
Presbyopia may begin as early as age 36 or as late as...