I I am not claiming any expertise just had a lot of experience. I suppose what your dr said is true . The extent depends on the intensity of the laser and the extent of the lasering. You are probably unlikely to notice much difference unless and until you have had several sessions of laser.
I have been having laser reatment for 5 years now .I also have macular oedema. I am very grateful o be able to see at all.
I have had so many sessions of laser i can't remember the number but it has been several times a year. Sometimes my vision is affected by the laser , someimes not.
When i began I could read the smallest print without glassses On a good day now and after steroid injections and in a good light i can sometimes read a little for a few minutes wihout my trusty magnifying glass.
This happened very gradually and occasionally improves for a short time. Unfortunately , it has to be said that some laser surgeons or operators are more skilful than others.
the good news is that most people respond much better than I do to laser and don't need the amount of treatment i have had,.
Any loss of central vision may well be minimal and unnoticeable. Just one session may be sufficient
for some. Hope this helps. If you are about to have laser reatment , I shouldn't worry ttoo much . I have advanced retinopahy, maculopathy and macular oedema - all in both eyes and I am still able to see {typos notwithstanding}.