LaMadrid did have contact lenses but I'm not sure if there are any that could possibly obfuscate the true eye color.
This is sometimes used as a plot device in the mystery genre but I don't know if there is any validity to that.
Do police take a close look at someone's eyes or is the information entered based on a mugshot?
This is a fairly small body part after all and lighting and camera, factors like that, can play a role in how it turns out in a photograph.
Just look at LaMadrid's photos. They don't quite look the same.
The second and third have blueish looking eyes but the first one has brownish looking eyes, at least I see them like that.