Tape is a basic low-vision aid that’s helpful in differentiating between bottles. Similarly, paper clips and rubber bands can be used as a low-vision aid to differentiate between objects of ...

OPTICAL LENSES,PRISMS,OPTICAL FLATS,OPTICAL GLASS FILTERS, HEAT ABSORBING FILTERS ETC. OPTICAL INSTRUMENTS LIKE ILLUMINATED MAGNIFIERS, MICROSCOPES AND LOW VISION AIDS ETC.

All this is significantly complicated by being blind, of course, so a tool like this Raspberry Pi low-vision system would ... using his smartphone as a vision aid, looking at the display up ...