I had pars planitis 30 years ago. now i have normal tension glaucoma. very advance i am under treatment but could it be a relation between both ?

Yes: Intra-ocular inflammation over a period of time (as in pars planitis or peripheral uveitis can cause decrease in outflow of aqueous fluid from the eye(s). This may lead to elevated intra-ocular pressure and optic nerve damage (glaucoma). There is no evidence that ntg is more likely than poag due to the prior history of pars planitis.

Yes: It is possible that when your pars planitis was active, you had elevated pressure and damage to the nerve. Inflammatory disorders can also cause optic neuropaties which can mimic glaucoma. Low tension glaucoma is usually a diagnosis of exclusion, once all other causes, like inflammation, have been ruled out.