https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14000056Edit ImageSaveSaveEditCropCustom TextMake it Yours.Remix, add effects & personalize with your own textCustomizeOr start from these designsA diagram to show the principle of Helmholtz's ophthalmoscope. Pen and ink drawing.MoreA diagram to show the principle of Helmholtz's ophthalmoscope. Pen and ink drawing.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 1104 px | 300 dpiLarge JPEG 2844 x 2616 px | 300 dpiFree Download