I am using a 22 inch lcd which has a resolution of 1920x1080. When I am using it on desktop (Windows UI) some things are a little blurry like the texts. But on games it looks good. Is HD resolution not that good on monitor size of 22 and below?
I think he would notice if his eye sight was getting worse.
Actually, you don't. You always get input from your eyes, and your brain is VERY good at adapting/compensating for degrading images. Maybe people don't know they have eyesight issues until its to late.
I think he would notice if his eye sight was getting worse. Give him some credit.
Depending on the distance a person is viewing a 22" 1920x1080 monitor, you may need to have 20/20 vision (considered to be "perfect vision") or better to be able to read small text.
As stated by 4745454b, vision loss can be very subtle and you may not realize your vision has degraded minutely until you test your vision. For example, earlier this year I went for an eye exam, the optometrist told me my vision has deteriorated slightly from around 2 years ago. However, it's not at the point where it needs to be corrected.