Is it normal to have a fear of the future?

Yes, but just a little bit of fear, if you are in normal circumstances in a normal country.  It should not be your biggest fear, but maybe #6 or less.

It is reasonable to be concerned about graduating, getting a job, moving to new places, etc.

If you are in a nation at war, with an epidemic, or with an economic collapse, or next to a nation with those problems, it is reasonable to have a lot more fear.

If you are in a nation that is next door to trouble, like Poland, which is next to Ukraine, or Senegal, in West Africa, near some nations with Ebola, it would be reasonable to have more concern.

And, when you graduate, find work that you like, and start to get good at it, and are doing useful things, and you have friends that you care about, and your family is mostly okay (doesn't have to be perfect) then most of your fears should become smaller *

*Unless there is real world danger, like you are living next to an active volcano, like some people in Italy, Japan, and the Philippines.

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So if fear is mostly reality based, and graduation does introduce a lot of unknowns, that is probably okay, as long a you don't lose too much sleep over it.  Talking to people who graduated, who got jobs, etc. is a good way to calm reality based fears - and learn some useful information.

If the fear is major, you are losing sleep every week, or your stomach is in knots, you might want to see a doctor.

And if the fear is not reality based - you live in Switzerland, and your fear Hurricanes, for example - then you really should see a doctor.
How does anxiety affect cognitive ability?

Brain fog, that is what you might end up with, with a chronic illness (lupus, fibromyalgia etc), depression, anxiety or other mental illnesses.Your ability to process information and to memorize will be affected by anxiety, racing thoughts, anxious thoughts will take over your mindset and your life to the degree where it leaves

What can we do to help our overall eye health everyday?

Probably the single most important long-term consideration for healthy eyes is to take good general care of yourself.Practice good nutrition! Treat high blood pressure (can cause MANY eye disease conditions). Take good care of your blood sugar, especially if you have any family history of diabetes (causes a high percentage of new