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Proportionally Spaced LEA Symbols Near Vision Screener Card
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52151
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This test is designed to measure visual acuity with a line test. Proportionally spaced (LogMAR) with two line tests with tighter spacing (50% and 25%). The test with 25% spacing often reveals difficulties in seeing tightly spaced details, which should be known when a child starts learning to read. Line sizes range from 20/400 to 20/10 (6/120 to 6/3) equivalent, 0.05 to 2.00. Response key printed on test card. Includes training cards and instructions.
16 inches/40 centimeters testing distance
Listen to NASN Radio Broadcast Vision Screening: Avoiding the Big Mistakes>>| Brand | Good-Lite |
|---|---|
| Assembly Required | No |
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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 symbols are easy to name, sign or point to on either of the included Response Key or Flash Cards.
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 system features line tests, single symbol tests and a crowded symbol test at high contrast. Low contrast line test with five contrast levels also available. Instructions are included with each test.
Card measures 8" x 10" (20.3 cm x 25.4 cm).
| Choking Hazard | No |
|---|---|
| Sterile | No |
