Heed the warning below and save yourself from many heartaches and even an untimely death. Yes some people have darker colored eyes, by nature. And in the case of sickness or age or eyes dim. Yet there are other reasons that cause the eyes to lose their light. Drugs, evil life style or a very unrepentant soul who has no future or prospect of salvation by will. Of course the enemy produces false light and that takes further detecting to discern those individuals who are probably more dangerous. It like colorful things that are poisonous, snakes, mushrooms, and of course people how dress inordinately to attract people under a false pretense.
Now days the younger generation and of course a larger number of baby boomer have applied tattoos and other accessories to their outward appearance. This has more to do with the fashion of the world, more than a internal damaged soul. It is not to say that this also can affect the soul. I have met many joyful people who have gone through this ritual, yes that what tattoos symbolizes. Unfortunately they usually tag people with identification to some tribe, organization and gangs. This group are made of people who are generally in search of an identification.
Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem. Ronald Reagan, President of the United States; 1985
Read what God has to say on the subject
Matthew 6 (King James Version)
22The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light. 23But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!