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LEA Symbols Distance Charts, 10 Line and 15 Line Tests

LEA Symbols Distance Charts, 10 Line and 15 Line Tests
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52149 LEA Symbols Folding Chart - 10 Line Test

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52150 LEA Symbols Folding Chart - 15 Line Test

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52444 LEA Symbols Non-folding Chart - 10 Line Test

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52445 LEA Symbols Non-folding Chart - 15 Line Test

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Product Description
Matches national and international guidelines for eye charts. These charts permit critical-line screening (using line that matches childs age 20/40 for children ages 3 and 4), and also permit threshold screening to determine whether a 2-line difference occurs between the eyes, which could suggest amblyopia.

10 Line Test
52149 is a 10 Line Test using crowded symbols for screening three to four-year olds. Proportional spaced on one side, 50% spaced rectangle on the other. Folds to 8" x 16". Has hole for hanging. Dimensions: 16" x 16"

15 Line Test
52150 is a 15-Line Test for screening children who may be old enough (five-year olds and up) to memorize the symbols in a screening situation. Proportional spaced on one side, 50% spaced rectangle on the other. Folds to 17" x 10.5". Has a hole for hanging. Dimensions: 17" x 21" in size when opened.

10 feet, 3 meters testing distance
Specifications
Assembly Required No
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Product Use
Product Use/Directions Lea Symbols Visual Acuity Test System developed by Lea Hyvarinen, M.D. The Lea Visual Acuity Test System is the only complete set of visual acuity tests for near and far distance vision for all patient groups 18 months and over. The tests are based on four symbols which blur equally at the threshold. The tests are designed to create a play situation where the child never experiences failure.

When no longer correctly recognized, the symbols transform into circles appropriately called "rings" or "balls" by the child. The child can still perceive that he/she is answering "correctly", while the examiner can easily detect the acuity threshold. The symbols are easy to name, sign or point to on the Key Card that is included.

Faq
Warnings
Choking Hazard No
Sterile No