Choosing not to wear glasses...

[nerdvana]

So, in the Bad Sight disadvantage (p123) GURPS has this to say:

Originally Posted by GURPS Characters, p123

At TL5+, you can acquire glasses that compensate totally for Bad Sight while they are worn. <...> If you are starting at a tech level in which vision can be corrected, you must take this limitation.

Bolded emphasis: Original Source
Underlined emphasis: mine

That requirement that you must take the limitation seems harsh to me. Some people cannot afford glasses and thus don't have them. But, since they are TL7 or 8 and glasses are available they have to take 15 points off the disadvantage and only gain as much as their fellow Bad Sight sufferer who can afford the glasses.

Could someone explain why this is balanced? I'm guessing that it is due to overlap with negative Wealth at those TLs (or Stubbornness if it is a willing choice out of pride or what not).

I am still of a mind to allow individuals at TLs >4 to have the 25 point version of Bad Sight if they do not have glasses to wear. Can anyone tell me why this is a bad idea?