Jazziecat,

To get a rough idea of whether your visual problems are possibly caused by too much or too little levodopa, or are not connected in any way with PD, ask yourself the following question:

Are your visual problems linked to your place in the drug cycle?

You start with low dopamine levels. You take a pill and levodopa levels rise, reaching a maximum after about a hour and then halve about every 90 minutes, until eventually you are back to your original levels. In that time you go from "off" to "on" and back to "off" again. So, if there's no difference over the cycle, it suggests the vision problems are unrelated to PD. If they are worse when you are "off", it suggests that a higher dose may help. Finally, if they are worse when you are "on", it suggests that it is a side effect of the levodopa.

John