Most commonly used for screening in healthcare of children age 3 to 5 and in amblyopia screening. Proportionally-spaced. Line sizes range from 20/200 to 20/16 (6/60 to 6/4.8) equivalent. The 20/160 (6/48) and 20/100 (6/30 have been omitted.
Why LEA Symbols and LEA Numbers?
The LEA Symbols optotypes were originally designed by Lea Hyvärinen, MD in 1976 and calibrated against the Snellen E, the international reference optotype of those days. Designing these four optotypes required much more work than one would imagine. The LEA apple and house were carefully developed and tested to insure they are equally legible with the square and the circle. Further refinement and testing of the LEA Symbols was performed in 1988 against the another emerging standard, the Landolt C, to insure corresponding acuity measurement. LEA Symbols have shown a high sensitivity for amblyopia without some of the shortcomings of the Landolt C optotype.
Has a hole for hanging the chart on the wall. Includes response key, flash cards and instructions. Chart Set is 16” x 16” (41 cm x 41 cm) opened and 16” x 8” ( 41 cm x 20 cm) folded.
LEA Symbols 10-line Folding Chart Set (10 Feet, 3 Meters)
- Brand: Good-Lite
- Product Code: 250250
- Availability: In Stock
Tags: LEA Symbols, 10-line, Folding Chart, Set (10 Feet, 3 Meters)