I saw a friend (Professional Photographer whom you can google) add a glint using a stylus and a pad in Photo Shop...Quite tedious!
I passed it on to Mike, and Viola!
Not only for people eyes, but works even better on Bird shots, (only have to do one eye on a bird), and grumpy mother-in-law photos.
If you missed Mike's video, here it is again.
https://youtu.be/2Ev7bGs4b_cSee screen snap Of his video sample.
Fred