Generally things that help your health is a need. Glasses? If you've had eye exams and don't need a change, then it's a want that you have for new frames? If you haven't had an exam, it may be you do need new glasses, and surely need your eyes checked!

Needs are food, water, shelter, love, purpose.... those are basic needs. Then those things which prevent poor health or enhance good health, those could be needs too.

No reason for guilt! Eye wear is very popular these days... and if you have a frumpy looking pair (not in any style of today) then it could also be affecting your mental health, and if a new pair would help you have a better outlook on life (pun intended) then do it.

I think you do NEED to make a list of PRIORITIES.

It's always easier to find a new job when you already have an old one...if it's bugging you (the old job) and you might end up quitting or losing it NOW is the time to find a new one. (Or evaluate if you are just bored with it and can add spice to your life in the avocation area, rather than changing vocations?)