Question

Difference between optical and non optical aids​

Answer 1

.Optical aid 
1. tactual aid-uses sense of touch 
example-braille
2. auditory aid-uses sense of hear
example-audio cassets,radio

non optical aid
1.)it uses high magnifying glass
2.) tactual aids ( using sense of touch ) . the visually impaired can learn to read and write by using a special touch system called the Braille 

example-convex lens


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Answer 2

Non optical aids:-

these often include (1) tactual aids ( using sense of touch ) . the visually impaired can learn to read and write by using a special touch system called the Braille . this system make use of raised dots on a paper . (2) auditory aids ( using sense of hearing ) include audio cassettes, tape recorders, audio CDs, audio books and electronic devices like computer / calculators / closed circuit television. these , with the help of a software programme , can transfer text files into sound.

optical aids :-

these include lenses and telescopic aids. while suitable lens combinations are used to rectify visual limitations, the telescopic aids can help to view class demonstrations and the blackboard .

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