LEA distance test, single symbol book with 4 symbols

81054-lea-ferntest-ringbuch
€72.00 *

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  • 81054
LEA distance book with 4 symbols (Art.-No.: 81054) The LEA-distance book with 4 symbols is... more
Product information "LEA distance test, single symbol book with 4 symbols"

LEA distance book with 4 symbols (Art.-No.: 81054)




The LEA-distance book with 4 symbols is used for testing visual acuity of young children around the age of 3. Visual acuity range from 0.1 to 2.5. 


Functional details 




Within this book, there are 4 symbols on each chart. They are in a logharhythmic order through the book. The Lea symbols make testing of children and illiterates easy. With an L-shaped occluding device, all other 3 symbols can be covered. This way, the test person cannot exclude certain Lea symbols, as he/she has no comparison. Testing distance is 3 meters. The included answer cards (1 symbol each) are for the children to show the doctor non-verbally, what symbol they saw. The larger transparent answer chart can be used by the children to show with a finger, which symbol they saw. It is transparent, so that the examiner can see the finger from the other side.


Technical details 




  • Spiral book, size 12,7 x 12,7 cm

  • 13 charts (1 visual acuity step per chart)

  • Optotypes: Lea symbols

  • Testing distance: 3 m

  • With 1 answer chart and 4 answer cards



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