EYE pressure Change.......Please read......

I went to the eye doctor for a check up last week. Well before I went I drank two cups of coffee on a empty stomach, and the night before was up all night feeding my newborn. Anyway I went to the doctor and he said my eye pressure was 26 in the left and 21 in the right. He check my optic nerve and said it was fine. After I left the doctor I stopped drinking caffeine and also started taking a multi vit for eyes and began a weight loss plan. Well three days later I went to get new Pres Glasses, and the guy at the shop checked my eye pressure, it was 17 on the left and 18 on the right.