My eyes

Today I got up early because I had to go to the clinic. I arrived around 9:30. I paid for the ophtalmologist.
I had to wait for a long time. After an hour, I was seen but only for a few minutes as a preview exam. Then I was waited for two more hours. I was so bored. Finally, I talked to the doctor who conducted my tests, There were three exams: visual field, cornea exam and I do not remember the name of the third.
All of the tests are to find out if I am suitable for a laser operation. I don't know the answer yet as I need a one more exam.

I've just realized that I used the word "exams" instead of "test", I think this second is right one.

My Eyes

Today I got up early because I had to go to the clinic. I arrived around 9:30 and paid to consult a specialist in ophtalmology.*
I waited for a long time and after an hour I was attended to but only for a few minutes and was given a preliminary exam. Then I waited for two hours more. So boring. Finally I talked to the doctor who checked my exams, The exams were three: visual field, corneal exam and a third whose name I don't remember.
All the exams are to find out if I am suitable for a laser operation, but i don't know the answer yet, as I need one more exam.

I've just realised that I used the word "exams" instead of "tests". I think this second is right. You were right the first time. In your medical context, 'examinations', or 'exams' are better.

*or, paid to consult an opthamologist.

My eyes

Today I got up early because I had to go to the clinic. I arrived around 9:30 and paid to see an ophthalmologist. 
I waited for a long time. After an hour I was attended, but only for a few minutes as a preview exam. Then I waited for two more hours. It was so boring. Finally, I talked to the doctor who checked my exams. There were three exams: visual field, cornea exam and I don't remember the name of the third.
All the exams are to find out if I am suitable for a laser operation. I don't know the answer yet, because I need a one more exam.

I just realized that I used the word "exams" instead of "test". I think this second is the right one.

Good! :) 
"Exam" and "test" mean the same thing, so you can use either one.