It would be better to see an ophthalmologist. If that is difficult then see an optometrist who would examine you and let you know whether you should see an ophthalmologist or not. A dilated pupil can indicate a pathology of the posterior segment of the eye. Drooping of the eyelid along with dilatation of the same eye indicates towards third cranial palsy or paresis. So, you should see an ophthalmologist and not a GP. Thanks.
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