I'm A 48 Year Old Male About 215 Lbs And

I'm a 48 year old male about 215 lbs and exercise 5 times a week. Occasionally (2x per month) I experience what I can only explain as a sudden loss of eye focus or seems like I crossed my eyes which last about 1 minute then goes away. Triggered usually by staring at something. Seen an eye MD who said things seem normal neuro wise. Also had a 30 day Holter Monitor which didn't show any heart issues outside occasional PVC.

Breathing was fine. thanks