Re: how do I fix red eye in Photos for OS X on my iMac?
Remove red-eye
Taking a picture using a flash can result in red pupils in a person’s eyes. You can remove the appearance of red-eye in a photo.
Note: The red-eye tool appears automatically when Photos detects that a photo was taken with flash. To have the red-eye tool appear all the time, choose View > Always Show Red-eye Control.
Double-click a photo, then click Edit in the toolbar.
Click the Red-eye button Red-eye button.
Tip: To quickly see the red-eye tool while editing, press E. Press E again when done making changes.
Click Auto.
Photos removes any red-eye that it detects in faces in the photo.
If red-eye still appears, drag the Size slider until the circle is the same size as the red-eye area.
Position the pointer over the red pupil and click. Repeat this step for all other red eyes in the photo.