Yes he is right.
As our eyes should work simultaneously.
So if we do surgery on one eye, the effect will be total for both eyes.
It's not like that if your right eye is going out means we have to operate that eye only .
On examination, whatever the non dominant eye will be operated.
And some exercises will be needed after surgery to maintain
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i am a pediatric ophthalmologists and squint specialist with 8 years of experience.
you may consult for further details.