Everyone should read this considering looking at a “far target” (not necessarily the hole) putting.
“During the information/practice session, participants were instructed on how to execute putts while using the FT visual focus strategy. Participants were instructed to change nothing about their normal putting method (green reading, posture, ball position, etc.,) until just before the initiation of the back stroke. Immediately before the back stroke, participants were instructed to slowly rotate their head (using only movement at the neck) for a final time so that visual focus was drawn down the target line and onto the FT. Once visual focus was confidently set on the FT, participants were instructed to keep their gaze fixed while executing their putting stroke. The FT in the study was defined as the point along the intended target line that was nearest to the center of the hole (Figure 2). Since the intended target line is based on the judgment of the golfer, the FT varies from participant to participant. Participants were instructed to think about starting the ball directly at the FT, while keeping in mind the speed they wanted to impart to the ball. While it was not an inclusion criteria, it should be noted that at the initiation of study all participants employed a NT visual focus strategy during their own golf games.” http://www.sashomackenzie.com/publications/MacKenzie 2017 Evaluation of Near Verus Far Target Visual Focus Strategies with Breaking Putts.pdf
this is a good video too