YOU SAID:
A tingling in his fingers begins to develop into pins and needles as his vision starts to double.
INTO JAPANESE
彼の指のうずきは、視力が倍増し始めるにつれて、ピリピリと痛みを感じ始めます。
BACK INTO ENGLISH
His fingers begin to tingle as his vision begins to double.
INTO JAPANESE
視力が2倍になり始めると、彼の指がうずき始めます。
BACK INTO ENGLISH
His fingers begin to tingle as his vision begins to double.
That didn't even make that much sense in English.