an image originally sourced from the US government EPA "Sunwise" program. It came in PDF format, i converted it into a raster image, then hand traced it section by section. the source image is in the pdf file found here: http://www.epa.gov/sunwise/doc/eyedamage.pdf 眼睛與標籤 anatomy、chart、Educational、epa、epa sunwise、eye 解剖學、圖表、教育性、EPA、epa sunwise、眼睛 資料來源:openclipart ( https://openclipart.org/ )