This article explains how to remove red eyes from photos in Photoshop. Instructions apply to Photoshop CC 2019 for Mac and Windows.
Sometimes when you take a photo of someone with a flash, the light from the flash enters through the subject’s pupil and reflects off the blood vessels at the back of the retina. As a result, their eyes appear to glow red. Luckily, there are a few ways to remove red eye in Photoshop.
To quickly remove red eyes from photos:
Open the photo and zoom in on the red eyes.