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The testing your optometrist wants to do is routine and is appropriate for your problem.
One of the machine measures eye pressure and is important in this case.
Another machines measures for a glasses prescription. If you do not need a glasses prescription, then it would be OK to not have that one done.
The other machine is to test your peripheral vision. This is good to have done to check your peripheral vision.
So, there should be no danger in the machine testing. Dilation is important to check for bleeding inside the eyes.
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