My advice, is continue with the clonazepam (Klonopin) for a few weeks to a month, basically until it's time to refill, then see if the visual perception issues fade. I'll admit I've never heard anyone complain about vision issues with this drug, except of course when they've consumed 10 times what you have.
Clonazepam is a good choice for a lot of people because it is so long acting. For most PsyMD's here in the states, the next thing you will try will be along the lines of lorazepam (Ativan) or alprazolam (Xanax). Both of these are relatively short acting, meaning you might experience some peak/trough action in between doses. Still, they are both certainly anxiolytic in action.
Diazepam (Valium) is another possible option. It's long-acting and it's metabolites take days to be fully metabolized. This will be especially true if you are dosing everyday. By taking the diazepam every day as you're supposed to, you can build up a foundation of it in your system, which will hopefully lead to the same relaxing/calming effect and timeline of clonazepam.
Oxazepam (Serax) Yet another long-acting benzodiazepine, considered to have a relatively lower abuse potential when compared with other benzodiazepines. It's found use most frequently as a means of lessening the severity of alcohol withdrawal, but can also be used as an anxiolytic, although the previously mention benzodiazepines are significantly more common. Yet again, this drug is long-lasting in a similar fashion to the clonazepam that you're currently taking.
Good luck and always be aware and mindful when undergoing therapy with benzodiazepines. Tolerance can build quickly, leading to dosage escalation, leading to full-on dependence, leading to benzodiazepine withdrawal syndrome; a nightmarish hellscape inhabited by all of your worst fears. Sorry for the dramatics, just make sure you monitor your use and treat these drugs with the respect they deserve.