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It seems that you have had very unusual symptoms and despite being evaluated by various ophthalmologists no obvious diagnosis has been reached. In cases like yours there are two possibilities - eye disease or neurological problem.
The fact that you have been evaluated by 3 ophthalmologists, I am presuming you have had your complete eye evaluation done to rule out any glaucoma, problems of optic nerve or problems in the macular area of retina. Since you have been operated for cataract also, that as a cause is also ruled out.
So, that leaves a neurological cause. I would recommend you to consult a neurologist for a detailed examination and if need investigations.
Hope this information is helpful
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