If these images are present after staring at an object or person, it is possible that they result from the corneal surface becoming dry from not blinking. If the after image happens again, I would try blinking or instilling a drop of an artificial tear (Optive or Systane) to see if the after image goes away. If you try not to concentrate on the symptom, it is likely that your brain will learn to ignore it. Also, ask your ophthalmologist whether or not the Xalatan could be causing any disruption in the tear film due to its preservative. You have a normal visual field and OCT; perhaps you have ocular hypertension and not glaucoma, and the drop is being used to decrease the risk of glaucoma developing. Other tests which should be done, if they were not performed yet, are gonioscopy to check the angle of the eye, and pachymetry to check the corneal thickness.
I will also note that at my work place we have strong fluroscent light bulbs and I had changed from 60w to 100w at home. I have made the change back to 60w at home and moving away from the fluroscent light bulbs at work and the afterimages have decreased. Further when I stare at an object with relaxed eyes the afterimages are less pronounced or not present. Could this all be from eye strain working at computer all day?
I call what your seeing Ghost Images... I have had this issue for over 1 yr 5 months with no answers.. My Opthomologist dosent even run special test. Just dialates and says everything is fine.. Go Figure..