I've only just seen your post.
I can't see how the problems with your eyes are related specifically to PD. It's good you are getting someone professional to look at that for you.
Re: your swallowing problems, this difficulty is to be expected, especially the sensation of things 'getting stuck' or being more effortful. Have you been referred to a speech therapist to look into this? If not you could ask you GP to refer you for an assessment. Or your PD nurse perhaps?
Sometimes in PD, people feel as though they are producing more saliva than usual, however it is often the case that they are swallowing their saliva less often, thus allowing it to build up and be more noticeable. This build up may be the exact thing that makes you throat clear-especially if a little bit of saliva trickles down the back of you throat towards your voice box. Of course it could be unrelated, but see what your speech therapist thinks. This article on speech and language therapy and swallowing difficulties (dysphagia) gives you more information about what a dysphagia assessment entails.
Hope it helps.