Retina scans and security technology in double color exposure effect https://www.rawpixel.com/image/3034270/free-photo-image-futuristic-remix-retinaView licenseSmart contact lens on fingertip new tech https://www.rawpixel.com/image/2763716/free-photo-image-contact-lens-blue-advertisementView licenseU.S. Navy optometrist Lt. Cmdr. Randy Birt (left) uses an ophthalmoscope to check the retina of a Tongan woman at a medical… https://www.rawpixel.com/image/8742498/photo-image-public-domain-woman-personFree Image from public domain license