Should I be worried about double vision? My GP recently cut my dose and I felt awful. One of the many things that have returned is double vision. There is a shadow under objects and letters. I also get very blurry vision. This had improved since raising my meds from September to December. I'm finding I'm now getting it mostly in the evenings, it's so difficult to read and write then. Also I was colouring with my granddaughter and I had difficulty match colours. Is this all just low thyroxine? I have since upped my dose as I couldn't stand the night sweats, exhaustion etc. Dr Skinner has told me to introduce NDT too. He has written to an endo I haven't seen yet, to consider prescribing T3.