Tabla optométrica de color de Snellen, no reflectante, acabado mate, tabla optom

Description

Tabla optométrica de color de Snellen, no reflectante, acabado mate, tabla optom
Snellen Color Eye Chart 22 x 11 Inches, 20 Feet
The first test designed to check for color blindness while simultaneously administering visual acuity.
An easy, convenient way to screen for color blindness in a busy medical practice or school.
Washable Eye Chart with No Reflective Sheet
The Snellen Eye test uses the idea of a subtended 5 minutes of arc with a 20 foot distance. This became the "standard vision" measurement. Also, Snellen developed the idea of a 5 x 5 grid for a standard for his optotypes. Each optotype must meet certain percentage requirements in this grid before it is used for testing. This helps to make a uniform and equal vision chart. The Snellen eye chart is the basis for many other vision tests.
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