There is a problem in either of his eye.

[tufguy]

1) There is a problem in either of his eye.
2) There is a rod installed in either of his leg.

Is it correct to say this if we are not sure which eye or which leg? Because we have two both of these so it is not natural to say 'one of his eyes or legs'. Am I correct?

 

[5jj]

it is not natural to say 'one of his eyes or legs'. Am I correct?

No. It is correct.

 

[tufguy]

No. It is correct.

How about my 1 and 2 sentences?

 

[5jj]

Neither is correct.

 

[teechar]

@tufguy, you've been a member of this forum for 10 years, but your English hasn't improved. I really wonder if you're a genuine learner at all!

 

[BobK]

If you used 'either', the problem statement would have to be in the negative (changing the meaning of course):

He does not have a problem in either eye (note: singular)
or
He does not have a problem in either of his eyes (note: plural)

I use the first version, but either is acceptable.

 

[Tarheel]

How about my 1 and 2 sentences?

That's not natural at all. Instead, say: "How about sentences one and two?"

 

[emsr2d2]

1) There is a problem in either of his eye.
2) There is a rod installed in either of his leg.

Is it correct to say this if we are not sure which eye or which leg? Because We have two of both of these so it is not natural to say 'one of his eyes or legs'. Am I correct?

They're both wrong.
1. There's a problem with one of his eyes.
2. There's a problem with one of his legs.