That leaves quite a few other causes. She needs referral to an ophthalmologist as soon as possible.
JCH MD
the case doesnot have diabetes mellitus nor induced spasm of accomodation
MedHelp.com is very specific that we do not make a diagnosis or treat individuals. With restatement of those principles the most common thing would be undiagnosed and/or out of control diabetes mellitus. Spasm of accommodation could cause those symptoms but its very very rare. Less common in 18 year olds: strokes, subdural hematomas, intercranial hemorrhage, myasthenia gravis, 6th cranial nerve paralysis/paresis.
JCH MD