i think it depends on how many/what type of tests.
i have really high prescription so i always have various tests
my exams are $95, but i only pay 50 bux coz carecard covers for it
However, if you have eye problems, I guess you can see your family doctor first then he/she should refer you to either an optometrist or a specialist. It should be free since you have an eye problem.
I went to the one in the corner of Westminster and #3 road in Richmond. It's right under the London Drug. 飛蚊症 is hard to cure because my mom has this and so far it's not cured.