First of all, you have nothing to worry about. My wife recently had some glaucoma tests done, and she was sent for the tests because her sister has glaucoma. The optician said that it could be hereditary. Anyway, back to my wife's tests: she had a "field test", which means that she had to look into a machine, with her chin resting on a support, and the machine had tiny lights inside, but not all of them were lit. She held a switch, and when she saw any of the lights flash she had to press the switch. This is not painful or anything like that, and it's done to check if you can see to the side without turning your head. Another test was where she rested her chin, again, on a support and the doctor used the machine to look inside her eyes. Again, no pain or discomfort. And that was about all. Nothing to worry about there!