How to zoom a specific application's window ???

Hello,

I have an application, that has fairly small fonts and no option to increase the font size.
So I thought, that maybe there is a way to zoom the window of that application on the
screen!!
I quickly found several apps, promising to aid in doing that, but soon my disappointment
was quite big, as they were zooming the entire screen (and I couldn't see the entire window
of a maximized application, which I have open in parallel) or just an area around the mouse
or I had to specify which coordinates on the screen to zoom (how annoying can that be ?!?).
And I wasn't able to find an app, which would just say - click on the window you want me to
zoom in to and that's all...
Please kindly help me !! Thanks!

Thank you for replying, but I have been playing a bit with that, and it is exactly what I do NOT want.
Once zoomed in, the entire desktop gets screwed up! And I need to zoom only that very specific window
of that very specific application...

Hello and thanks for your replies !!
I have been playing with the lens of Magnifier and it is very cumbersome. It behaves like a real lens, meaning, that when you reach the edge of the window with the edge of the lens, the lens is showing a different area of the window, it is extremely unprecise and unhandy - typically microsoft... It looks nice, but it is not useful !!
I have also played with Sysinternals. I didn't like it, I don't remember exactly, as it is already a week ago, but I think that it crashed, once I tried to set it to zoom only an area of the screen.
What I expect, instead, is just to point a window, and that the program would automatically find the corners of that window and zoom it let's say by 25%. I am not a developer, only have studied it for a while at the university, but it can't be THAT difficult to get the coordinates of the corners of a window !!! And nobody ever thought of that... Bearing in mind today's billions of existing apps, I can't believe it !!!