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The prism effect can be due to various reasons -
- increase in intraocular pressure of the eye which can indicate beginning of glaucoma
- start of floaters or vitreous detachment in the other eye. The same thing which happened in your eye 2 years back, might be beginning in the other eye
- rarely can be the first symptom of beginning of migraine headache
otherwise can be due to dryness of eye, change of spectacle correction etc.
I would advise you to consult an ophthalmologist to rule out the above possibilities.
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