Fortunately I have good enough eye sight that I can read the time on my alarm clock without needing my glasses. However, if you do, how do you see what time it is at 3am in the morning? Does your clock look like this at 3:24am?
Mono-coloured number displays come from the days before multicoloured LED's were cheap and easily available. Now with a range of colours, surely someone could make a mutli-coloured version? The numbers could look like this.
What time is it?
You can't read the digits, but once you've become accustomed to the colours, you can quickly see what time it is.
Is it time to get out of bed?
What about now?