what is the time for persistence and define optical and non optical aids in easy language please answer me fast Tommorow is my Exam...... Plz plz plz Answer Fast
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Non-optical aids help patients deal with everyday problems where sight is impaired. A review of the many non-optical devices is discussed including relative size devices, writing and communication aids, posturing and positioning aids, illumination control and non-optical sensory substitution devices.
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