A Snellen eye test chart. Unfortunately, I couldn't locate the original font used, so I had to substitute a similar one and make it bolder... tell me if it's adequate or help me find the right font.
Snellen眼睛測試圖
Chart、Diagnostic、Doctor、Eye、Health、Medical、Ophthalmology、Optic、Optical、Optician、Physician、Snellen、Test
圖表、診斷、醫生、眼睛、健康、醫、眼科、光纖、光纖、配鏡、醫師、趕、測試
資料來源：openclipart ( https://openclipart.org/ )