Open 5mm blades. Blade spread: 27mm. Dull finish. Overall length: 45mm, 1.8 inches.
Materials : Stainless Steel
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Open 5mm blades. Blade spread: 27mm. Dull finish. Overall length: 45mm, 1.8 inches.
Materials : Stainless Steel
Open 5mm blades. Blade spread: 27mm. Dull finish. Overall length: 45mm, 1.8 inches.
Materials : Stainless Steel
| Blade Size | 5mm |
| Blade spread | 27mm |
| Overall length | 45mm, 1.8 inches |
| Material | Stainless Steel |
The LEA 3-D Puzzle is designed for supporting the development of the concept of “same”, first with colors, then with black & white concrete forms that are prerequisites for the measurement of recognition acuity with the LEA SYMBOLS® tests at an early age.
Test for quick measurement of low Contrast visual acuity at 25%, 10%, 5%, 2.5%, and 1.25% Contrast by measuring the distance where the symbols are seen. 10M symbols correspond to visual acuity 0.10 at 1 m, 0.05 at 0.5 m and 0.3 at 3 m. VA values are thus easy to calculate. Test includes a table for conversion to Snellen equivalent VA values, a response keys and instructions. 6 pages, 3.25″ x 9″ (8.25 cm x 22.9 cm).
Small Fixation Disparity Polarized Target Vectographic two-dimensional card with 2 Fixation Disparity Crosses positioned vertical to one another to facilitate the comparison of binocular performance when using a lower versus higher spatial frequency or acuity demand.
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