Right eye is lower than my left eye?

[SilverStorm]

I noticed it early this year and I'm not entirely sure how long it may have been like this for but I've noticed it in some pictures when I was 15/16 also (I'm 19 at the moment) and in these pictures it looks as though my right eye is lower by a few centimetres than my left eye and I'm a bit converned about this.
I wear glasses so my vision isn't perfect, and a while back the opticians told me my left eyebrow was higher than my right but they didn't say anything about the eyes not being the same height.
I'm not sure if I'm noticing it wrong  or one eye is higher/lower than the other, but there isn't any weird or unnatural pains that could go with this I don't think.  I get headaches when I'm really tired but that's natural, and my eyes are tired at times when I'm feeling tired also (when I've been up for a long amount of time with 7-8hours sleep).

I've attached an image showing.
The last picture in the image was a kind of stare/glace-look, but I've noticed in this one my eyes seem almost perfect in comparison.

I really don't know what it could be though.
What do you think the problem is?

[SilverStorm]

p.s  and what do you think could have caused it?

[SilverStorm]

Thank you
What do you think about my eyes though? Because really it's only the difference in height that worries me I think.
Regarding of what it could be you don't think it could be serious do you?

[Ray T Oyakawa, MD]

It is hard to tell what the problem is from the photos.  You do have an asymmetry of right brow compared to your left.  I would not worry about it unless it gets worse.

Dr. O.