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/ )