Hi
Usually if your having blurring of vision ,it shall be corrected by sight check up with some power.Some cases if it is not improving with sight check up alone,then we need to see if there is any other problem which is causing blurring.Dilatation is done to check Retina behind the eye called fundoscopy.It is a routine checkup to rule out any other problem but if you find out anything important to deal we should not ignore.You need to consult eye specialist for sure to undergo that test.
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Consult eye specialist near you