explain how opitical and non opitical aids help visually challanged persons to develop their skills to higher leavel
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Optical aids
Low vision optical aids are task specific. They include one or more lenses
which are placed between the eyes and the object to promote enlargement or
magnification of the retinal image. Some of the devices are stand and hand held
magnifiers, small telescopes, loupes and strong magnifying reading glasses.
Spectacle-mounted telescopes leave both hands free so they can be used for
longer viewing periods like watching television, a program, a ball game or a
movie.
Small telescopes improve the ability to see distant objects or people.
Non optical aids
They help patients with sight impairment to deal with everyday problems.
Some non optical devices are reading stands, absorptive sunglasses, supplemental
lighting, tactile locator dots and typoscopes.
Bright coloured bumpy marks can be placed on objects so that the person
with low vision can easily identify it. For example if such a mark is there on
the oven dial the person can easily find the 350 degree mark.
Higher level of illumination or moving the light source to the side of the
better eye can help the patients in seeing things.
Low vision watches are useful for students who are learning time management
skills.
Low vision optical aids are task specific. They include one or more lenses
which are placed between the eyes and the object to promote enlargement or
magnification of the retinal image. Some of the devices are stand and hand held
magnifiers, small telescopes, loupes and strong magnifying reading glasses.
Spectacle-mounted telescopes leave both hands free so they can be used for
longer viewing periods like watching television, a program, a ball game or a
movie.
Small telescopes improve the ability to see distant objects or people.
Non optical aids
They help patients with sight impairment to deal with everyday problems.
Some non optical devices are reading stands, absorptive sunglasses, supplemental
lighting, tactile locator dots and typoscopes.
Bright coloured bumpy marks can be placed on objects so that the person
with low vision can easily identify it. For example if such a mark is there on
the oven dial the person can easily find the 350 degree mark.
Higher level of illumination or moving the light source to the side of the
better eye can help the patients in seeing things.
Low vision watches are useful for students who are learning time management
skills.
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