This may give you an idea:
https://adwords.google.com/select/Tr...timatorSandbox
It's often completely innacurate though..
The best thing to do really is to knock up a quick 2 page site of contact lense content, and test it out. A budget of £50 would give you an indication of what is possible.
As a complete guess I would say somewhere between 50p and £1 a click to get volume, but I really have no idea.
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