I know this is an old threat but I am intrigued by the vision effects you mention, OP. Are you still taking Coluracetam regularly? If not, why not? And if so, have you noticed any change in the effects over the past few years?
Any chance you've had any kind of objective visual tests done by an optician or ophthalmologist while under the influence of Coluracetam? ie, acuity, visual field, that sort of thing...
I use Coluracetam intermittently amongst a few other nootropics and while I remember noticing some mild mood-brightening effects for a while, honestly like all the 'racetams and most other nootropics I've tried (except Phenylpiracetam) it seems like these effects faded to the point that I am not confident I could distinguish them from placebo.
I notice "colour brightening" is something that a lot of people report from taking racetams, and, again, some of the other more subtle nootropics, but I have always been a little skeptical of this even having experienced it myself because it is just such a vague and quite possible placebo-genic effect. On the other hand Coluracetam I know unlike the rest is supposed to have some kind of protective effects on the visual system in certain types of optic nerve injury, if I remember correctly, as it's been a while since I looked into it... so would be very interested to hear of any objective data, especially from someone with an actual, diagnosable visual impairment.
Something else that used to put me off about Coluracetam even while I felt it was working was the very short duration - OP, do you notice that the visual effects fade after 3-4 hours, like the bulk of the effects do for many people? Or is this effect something more persistent?