The tapes give me blurred/double vision. Anyone else?

I haven't seen anyone mention how hemisync can effect you physically after a meditation. My vision goes blurry with double vision ever so close (like an overlap that is just off from each other) I assume it's my brain with the hemisync sounds. Anyone else have this or anything like it? I'm only on wave 1 and even as an experienced meditator I haven't had my vision like this change after deep meditation. It lasts around 10-20 mins afterwards. Please someone tell me I'm not the only one having this.