How to change your eye color when using photo-shop?

I saw a person change there eye color into different colors.I said that was really cool.I wanted to learn how to do that.But i do not wanna download stuff.It makes my computer slower.Can anyone help?How to change your eye color when using photo-shop?
there is a tool on photoshop that i use. it is like an airbrush and yoou can use colr, but it doesn't completely change the color like on the paint program. it adds color to the eye i can't explain it. you have to play around with it to figure it ouot.How to change your eye color when using photo-shop?
This is what I do, I fond it gives me greater control (this is for PhotoShop CS3 or CS4 on a Windows platform).





Zoom into the eye area, the picture should be fairly large, at least 1200X1600 pixels.





Then use the Polygonal Lasso tool (I find it gives me greater control than the plain lasso). Using the tool click on an area just barely inside the eye, since the Polygonal Lasso only goes in straight lines you go straight a little bit, then click, go straight again but in slightly a different direction, then click again until you've come full circle around the iris. (The reason that you start slightly inside the iris is because the iris has a very small dark ring on the outside, most people don't know this)





Now that you have one iris selected, you have to add the other iris, again use the Polygonal Lasso, except this time you have to hold down the shift key to add to the selection, then use the same technique as before.





Once you've completed the selection make a ';Feather'; around it, this will smooth the selection, press Control+Alt+D at the same time, in the box that opens put a 1 or a 2.





Now you will copy the selection by pressing control+C, then immediately paste the selection on top of the image by pressing control+V. Now you'll have a layer with just the irises.





Now you can recolor using the following tools and depending on what you want to achieve:





Image:Adjustments:Hue/Saturation


Image:Adjustments:Selective Color, use the Reds, Cyans, Blues and Naturals


Image:Adjustments:Variations





To slightly adjust the lighting use:


Image:Adjustments:Levels





Sometimes in pictures the eyes come out pretty dark, and some people have naturally dark eyes, in these cases I opt for a complete iris replacement using irises from a collection of pictures of facial ';parts'; that I have, but you can find plenty of pictures of irises by using Google Images.
Trace your irises with the selection tool. Copy %26amp; Paste. Make sure the pasted layer lines up perfectly with the original eyes. Under ADJUSTMENTS choose the hue/saturation tool and use the sliders to change the color. Alternatively, you can choose REPLACE COLOR and do the same thing.
Duplicate your image on a second layer on top of your first layer.





Erase everything else other than your eyes - every single thing except for the thing you wan to change color





Then use HUE to adjust the color of the eye.





Seriously, go to youtube and just search...