Can you tell me is there any definitive treatment for cystoide macular edema?

Yes. First an evaluation to determine cause must be done, then the caused treated. For the edema, itself eyedrops containing steroids and non-steroid anti-inflammtory agents are used. If this fails to work, then injections of anti-vegf agents, such as avastin, (bevacizumab) can be done. See a retinal specialist for this problem.