I am a 52 years old man, having corneal opacity in my right eye since 2003. this opacity appeared after healingof the corneal ulcer caused by contact lenses. what should i do?

Depends: If the opacity is central and interferes with vision, then you might consult with a corneal specialist about means to minimize or correct it. If it is peripheral and does not interfere with vision and is not uncomfortable, probably then it is best to leave it alone.

Corneal scar: I assume your question is why you have the opacity? Because of the depth of the ulcer, it left a scar behind. Depending on the size and how dense the scar is, you may be able to see it with the naked eye.

Permanent: Scars that develop after corneal ulcers are permanent. If outside of your visual axis, they pose no vision problem. If central, the y permanently decrease your vision.

Depends on vision: Obtain a consult from a corneal specialist who has special instruments to evaluate the severity and possible treatment options. Good luck...