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Resolution is kind of like looking at 2 unfinished walls through binoculars. One made from cement blocks [300 dpi] and one made from bricks [600+ dpi]. A diagonal view of the wall end seen through the binoculars [increased screen resolution] is a jagged line of steps with 2-3 times more steps in the brick one than in the cement block one. When viewed from a distance [low resolution] they both look like a straight line.
 
To see the images better, they need to be bigger. When they are magnified they will be fuzzier on the edges, how much depends on the magnification, the resolution and size of the display, and the dpi of the image. 

I think I would try reading glasses first or a page magnifier [if you can find the right size].