I agree, a change in your vision is one of the rare side effects of clomid. Femara is another similar drug that can be used, and usually without as many side effects. If I were you, I would try to talk to the doctor about this as soon as possible. I don't really have any experience with PCOS, but eating better and exercising certainly wouldn't hurt. Good luck to you and I hope you get this all figured out soon! :)
I have heard of blurred vision being one of the possible but rare side effects.
I would talk to your doctor. There's other meds out there that you could try like femara, metformin, or you could consider injectible meds, which seem to work really well at our age... (I'm 35 so i can totally relate!!)
I have been on clomid + iui for two months now and about to start my 3rd consecutive month. After the first of the year, we're stepping up to injectibles.