Temporary blindness has a variety of causes
However, as I do not know the specifics of your granddaughters case, I cannot say which specific one is more likely
There are some
vascularArteriosclerosis of the extremities
Birthmarks - red
Dementia
Heart disease
Intravascular ultrasound
Mesenteric artery ischemia
Renovascular hypertension
Replantation of digits
Stroke
Tobacco and vascular disease
Vascular headaches causes such as occipital lobe migraine,
ischemiaHepatic ischemia
Ischemic colitis
Mesenteric artery ischemia
Testicular torsion
Vertebrobasilar circulatory disorders (lack of blood flow) to the optic
nerveNerve biopsy
Nerve conduction velocity or retina, small blood
clotsBlood clots to the eye
circulationCirculation of blood through the heart
Circulation of lymph
Diabetic blood circulation in foot
Vertebrobasilar circulatory disorders, or a
vasculitisNecrotizing vasculitis
Soemtimes pressure on the optic nerve can cause transient blindness, so-called, 'visual obscurations', caused by a mass behind the eye or increased pressure in the CSF or brain venous system such as idiopathic intracranial hypertension
Transient blindness due to metabolic disease is probably uncommon - an earlier age is more typical. There are also psychiatric causes such as psychogenic blindness. There are frug related and toxic causes also
These are conditions that you should discuss with your doctor to see how likely any of them are. Of course, she should have a good dilated eye exam, visual acuity and visual field testing. An electrical visual evoked potential study may reveal an optic nerve problem, or if normal in the presence of blindness suggests pschogenic blindness. An MRI can ruleout a mass lesion, and an MR venogram can evaluate the brain venous system.
IF you are in the Ohio area, Drs. Lee or Kosmorsky at teh Cleveland Clinic Neuro-ophthalmology Center could help
My Niece of two and a half yrs old complains of temporary blindness, on 3 occassions that I know of, lasting no more than 30seconds usually less. Her mother seems to not want to take her seriously and has not been to see her GP (doctor).
Usually this occurs upon waking from a sleep during the day, Yesterday however she was walking across the kithchen when she suddenly became distressed and complained she couldn't see. This lasted about 5-10 seconds. Being a Podiatrist I noticed that her gait changed during this time, to maintain her balance as one would if suddenly blind, which is why I don't think she is pretending or something as her mother seems to think.
What would be your advice?
Cheers Dave Smith