Cameron Diaz's face image above, probably is just a result of retouch, so it is quite different from the original image. However, the result will not differ 180 degrees. A feature that can not be changed in a very, is the primary color of Cameron Diaz's eyes, i.e. blue.
Now talking about Cameron Diaz's eyes. In size, her eyes are not as big as Aishwarya Rai's eyes, where most people assume that the beautiful eye, was an eye with big size. But apparently, if Aishwarya Rai eyes "to put" into Cameron Diaz's face, what will happen is just the opposite. Cameron Diaz's face would be disproportionate, that is not beautiful.
So the beauty of the eyes of Cameron Diaz, is not from its size, but lies in the blue glow emanating from the iris. In addition, this glow becomes very clear, or very transparent, because it arises from Cornea, the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Together with the lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical power--Wikipedia's cornea. A very clear blue glow, revealing that Cameron Diaz's blue eyes are healthy.
Now come three curiosity: Did Cameron Diaz's sparkling or glowing blue eyes is result of a transplant?, Or did Cameron Diaz diligently consume vegetables and fruit? or also, It's only an effect of contact lense?.