If the child has no other symptoms, then an optometrist would be the first step.
If you are having problems with your vision, you would visit an optometrist. The negative to this is that they can only correct vision problems with glasses. If anything is medically wrong, the optometrist can't help.
Pituitary gland cancer can cause headaches and blurred vision.
If a person needs to receive an eye exam because of blurred vision or they can't see the words anymore, they would go to an Optometrist. This type of eye doctor would examine your eyes (not painful at all) and can prescribe eye glasses for you if needed.If you have a special eye problem example: High eye pressure the Optometrist will refer you to an Ophthalmologist; they perform Laser surgery, surgeries, and prescribe medication if you need it. Dealing with functions and diseases of the eye.
Optometrist
An astigmatism means that the shape of the optics cause the focus to be a line rather than a point (the lenses are not spherical). Thus the image produced by these lenses is imperfect, causing a blurred image/vision.
Having bouts of dizziness and blurred vision can be caused by a variety of things. The most likely culprit is low blood sugar. However, it would be best to see a physician to find out for sure.
The two most likely causes would be a hangover or a migraine. If in doubt, see your GP/family doctor.
I would say Stroke or TIA, sort of like a mini stroke. I would see your Doctor as soon as possible. Because if it is one of the two, you would have less complications by seeing Dr. as soon as possible.
Information available on several websites on the internet states that a child suffering from excessive blinking should be checked by a doctor and or optometrist to find out what the causes may be. Causes may be scratches to the eye ball surface or something as simple as conjunctivitis. The other cause is blurred vision in a child that needs glasses. the treatment may be prescription glasses for or eye drops, it would be prescribed according to the cause of the excessive blinking.
It sounds like you are talking about vision therapy. The only problem is that without a thorough evaluation, I can't really tell you what types of exercises would help you personally. Seek advice from an optometrist who specializes in vision therapy in your area.
Diabetes can cause all of those symptoms
There are several. You would first see an optometrist: he or she would diagnose you and decide if you need to see a specialist. If your condition is serious enough, the optometrist would then refer you to an ophthalmologist.