How Do I Enhance Eyes in Photoshop Elements?

Move the Magnetic Lasso tool to one of the eyes and click around all or just the section of the Iris you want to enhance. Do this until the shape is complete and your line looks like running ants. Repeat on the opposite eye. Once both eyes are selected go to Enhance Menu>Adjust Lighting>Brightness/Contrast.

Can Colour of eyes change?

Eye color also can change with age. This happens in 10 to 15 percent of the Caucasian population (people who generally have lighter eye colors). For instance, my once very brown eyes are now hazel, a combination of brown and green. However, some hazel eyes actually get darker with age.