Yes - just make an appointment. It is very easy.
I suspected my DS had problems at age 11/12. I was teaching him for a bit, temporarily, and it was only in the classroom that I saw him occasionally squinting but generally avoiding board work.
I took him to the opticians and found out that his eyes were -2 something. I was horrified. As we were walking around the shopping centre while waiting for his glasses to be made, I kept pointing out posters and signs, saying, 'I bet you can't read that'. Sure enough, he couldn't. But he didn't consider it a problem because it came upon him so gradually, so it was normal for him.
On getting his glasses, he hasn't looked back. It's the one possession that he truly values.