Syntonics or photolight therapy is a vision therapy procedure that may be used in a vision therapy program. Syntonics is the use of low level selected wavelengths of light or colours to stimulate the eyes. The theory of syntonics is based on the idea that the sympathetic and parasympathetic branches of the autonomic nervous system are not synchronized and unbalanced in some people.
Syntonic therapy begins to balance these two systems. The reasons for an unbalanced system can be due to toxicity (e.g. history of fevers, physical trauma, or psychological trauma). The specific patterns of peripheral vision loss are best determined using kinetic field tests. The functional field losses are related to either hypo or hyper arousal of the sympathetic nervous system. In practice, peripheral vision is affected when these two systems are not in balance. This in turn causes difficulties with the other visual skills especially tracking, fixation, and binocularity.
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