Hi Jess, the hormaones from pregnancy can affect the accuracy of your vision, in fact my optomitrist knew I was pg before my DH did. I went for an eye test the day after I took the HPT and after doing the eye test she asked if I was pg as there was such a huge diff in my vision from last time. It can remain until after weaning.

It can also be a sign of BP as Tiff said.