For myopics like myself usually one eye is more dominant than the other. Your left eye is the dominant eye but now your right eye is trying to be dominant too, maybe that's why you feel a bit off. You could try a -6.75 instead of -7 for the right eye. A -0.5 jump could be too much for you.
Well 28 is not the typical age for presbiopia.
But what you told me seemed to be typical.
On the one hand you could try to put on low power reading glasses while having the new contacts in your eye to see whether near vision is perfect.
But at your age another evaluation by an ophthalmologist would be appropiate.
It may just be a question of getting used to the new lens. Maybe your eye is not used to full accommodation to near vision and needs some (more) time to adapt.
I'm 28 ... reading glasses on top of lenses?
No, of course not.
At least one eye needs to be corrected to full distance vision.
How old are you?
I think you need reading glasses for near vision. With your old prescription you did not notice that you developed a presbiopia.
Try your new prescription for some days and when your near vision is not sufficient try reading glasses.
What I've also found is that with my old lense prescription - the right eye feels weaker, but is better for close up reading, while the left doesn't feel as good up close, but is much better for distance. Is it possible that my left eye maybe needs a weaker prescription?
It may take a short time to get used to your new prescription. If you do not get your prescription checked.
Dr. O.
So you have adapted to this kind of monovision.
Left eye is for perfect distance vision and right eye for perfect intermediate.
You could also go back to full correction of both eyes but you will need some time to adapt.
In the end it is your decision if you want to have both eye corrected for distance for perfect stereovision or to keep this monovision. With monovision you won't need bifocals when you get presbyopic.