Don't patients need protection also?

I was at my optometrist office just now to renew damaged reading glasses. Their website warned us that the office would take our temperatures upon entry, and I had my "script" ready:

What if I refuse?
and their "question" (May I use this device to take your Temp?) is really a polite command.   

Since vision is essential, legally and otherwise, do we have a practical choice??

My Q now: don't people with fevers 
(from whatever cause, and 
who would apparently be denied opto services) also need their eyes tested and need usable reading glasses too?? (The "temperature lady" couldn't answer)

2017-04-11T00:37:33.809Z