Why does my screen have horizontal lines over everything that is blue?
I took that picture with my phone, I had to adjust the looks of the image for the lines to show up. If you look at the image from a distance you will see faint, horizontal lines across the App Store icon.
But this is not the only place these lines occur. They occur over everything that is blue; buttons, other icons, etc. From afar, the lines aren't really noticeable. But up close they really get annoying.
My Mac is a Late 2013 2.3 GHz MacBook Pro with an intel iris pro and nvidia 750m graphics card.
I took a screenshot on my Mac of the icons and zoomed in on the image to see if the lines would enlarge. But they did not, which means these lines aren't part of the design of the buttons/icons.
Furthermore, my sister has a similar MacBook Pro (just with the intel iris pro, not the 750m), and the lines did not show up.
More importantly, I am running High Sierra, whereas she is running Sierra.
So, could this be a software or a hardware issue?