Vision Aid trainers know that teaching vision impaired is not the same as teaching a sighted person. They know that "touch and hearing" are the means for acquisition of knowledge for the vision impaired student. Some principles followed by Vision Aid have become set tall standards :
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For example, the first lessons of computer for a sighted person include "seeing" the equipment or pictures like the schematic below ( from Wikipedia ) :
1. Monitor 9. Keyboard 10. Mouse and the CPU that houses 2. Motherboard 3. Processor 4. RAM - the operating memory 5. Add on cards plugged on the motherboard 6. Power supply AC to DC 7. Optical drive that takes external DVDs and CDs 8. Hard Disk Drive that stores all electronic data of the computer.
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