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My dear and respected teachers,
1: "I met him when he came here in Pakistan" correct?
2: "Carrots will sharpen your eyesight" correct?
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Hi Twilit

In your first sentence, you should use the preposition "to" and I would omit the word "here":
1: "I met him when he came here in to Pakistan."

Your second sentence is OK grammatically.
Comments  
1: "I met him when he came here to in Pakistan" correct?

2: "Carrots will sharpen your eyesight" correct? Yes.
 Yankee's reply was promoted to an answer.