What Am I? #7

A descriptive poem guessing game. You read the clues, and place in the comments section- when you had figured it out, if you in fact did! Come on, play along, tell us, we ALL want to know when you figured it out!

CLUES:

I have seen a lot of things in my time,

I am something you take with you everywhere-

I am helping you read this rhyme;

And sometimes there are things I can wear!

I have needs that require attention,

There are a few people around who can't use me-

When that happens there is a dog intervention;

You have only two of me, not three.

Some people put things into me,

Things to change my color, and help me too-

You could live without me;

Color choices are usually brown, green, hazel and blue!

However now that there is technology about,

Your choices can be anything you desire-

One thing I can't do is shout--

But things you can dress me up with can have wire!

I don't know what else to tell you,

Without totally giving myself away--

Other than the fact that I can cry with you;

I don't know what else to say!!

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What am I?

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Your eye, eyeball, vision, etc.