Hello, Thank you for your query. Intermittent vision loss could be due to problems with the eye itself or interruptions in the circulation to the brain. I recommend : - a ophthalmologist consult - to check if everything s ok with the eye (pressure, retina, optic nerve & artery) -blood cholesterol and sugar levels (ideal to check sugar levels during or just after these episodes). -a pediatrician/pediatric cardiologist consult to check for arrthymias and pumping problems of the heart. 24 Holter monitoring to check for arrhythmia - a carotid doppler to see if the blood flow to the brain is hindered -MRI with MRA to check for any brain lesions and blood flow obstruction to the back of the brain (where the center for vision is located in the occipital lobe) - an Electroencephalogram to check for seizure activity in the brain. -check his blood pressure and pulse during or as close to the episode as possible These tests may not all be necessary but it is important to find out what exactly occurs and the cause behind it. Vision disturbances occur when there is any problem along the path way through which the eye receives and sends its signals. That is to say anywhere from the occipital lobe (above the neck at the back) to the back of the eye. Circulation problems, tumors compressing optic nerves, an over sensitive carotid body/VAGAL reflex, eye disease can all cause this. If diagnosed early, life threatening complications may be prevented. Please get him evaluated asap Hope this helps. Please let me know if there is anything else I can help you with Wish you both good health