Hi. I'm online and happy to answer your question today.
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I guess you have stepped away from your computer.
If you are talking about curtain or veil like film that is "blocking" your vision and, when you look in the mirror the external part of your eye appears essentially normal, then I fear you are suffering from very serious and possibly blinding, condition.
I fear that you may having a retinal detachment. This requires immediate treatment by a retina specialist. Left untreated it will cause total blindness in almost every case.
If you can not get in to see an eye doctor immediately you should go to emergency so that they can call in an ophthalmologist to examine you.
Does this answer your question to your satisfaction?
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I have seen an opthalmic professional in the hospital who has sent a letter to my doctor requesting he make an appointment with a physician and then go back to her in one month. Your explanation is frightening.