@empara Like Don ( @dsh33782 ), I have had glaucoma for many years and am VERY protective of my eyes.
Even without actual changes from glaucoma, you can have increased intraocular pressure, which is usually the precursor to the disorder. Xalatan (latanaprost) decreases that pressure and protects your vision. Was it prescribed during a routine exam by an optometrist, who is the eye doc most commonly seen by people without vision problems?
Are you seeing an ophthalmologist, who is an MD specializing in diseases of the eye? Have they done any scans or (mechanical) visual field tests to determine whether there may be subtle changes? With your family history, that's what I would do if it hasn't been done already.