written by Ann Kujundzic
reprint permission by : BADD Newsletter
Dizziness can be a sensation of imbalance or unsteadiness which can manifest in vertigo (rotation, whirling, swaying) or in faintness. Dr. Lindley emphasized that eyes are usually not the cause of dizziness, but certain eye problems can aggravate the symptoms because of their relationship within the balance network. The eyes give us input as to where we are in our environment. This information is transmitted along with input from the semi-circular canals in the inner ear, and from sensors in muscles and joints, via the central nervous system to the cerebellum. The brain learns in early childhood to integrate messages from the three sources. So where do things go wrong?
Some of the "insults" to balance are conditions such as labyrinthiitis, tumours, strokes, and the oft-heard condition called "the aging process". However, medication, new glasses (bifocals in particular), ocular muscle imbalance (which can cause spatial disorientation, i.e. double vision) and nystagmus (described as shaking or dancing of the eye) can also cause visual confusion. So what can we do for these?
Dr. Lindley (neuro-opthamologist & Asst. Prof. at U.B.C. in B.C.,Canada) suggested we should not make sudden changes in the base curve of lenses in our glasses. It would be wise to beware of bifocals, and especially progressive lenses. Prism correction should be checked and the glare on prescription glasses minimized. If you need extra proprioceptive input, use a cane to provide this, and wear soft soled shoes.