Sometimes, it's necessary to check myself before I wreck myself when it comes to squinting in front of the computer. My eyes are already working Internet overtime, and maintaining my vision is essential to my job. Obviously. Now, when I need to see little details in a photo (like figuring out what kind of cell a celeb is carrying), I magnify my screen using Ctrl + Scroll. "Click and flick" if you will.
Just hold down the control button, and scroll up with your mouse, and your screen will magnify for easy viewing. It's like getting one of those remote controls with massive buttons so you can see what you're pressing. Except, you know, it's your computer screen. Man, I'm getting old.