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بيت / Visionären / لوازم الفحص والمواد الاستهلاكية
مخطط عيون سنيلين ملون غير عاكس بلمسة نهائية مطفأة اللمعة، 20 قدم in Kuwait

مخطط عيون سنيلين ملون غير عاكس بلمسة نهائية مطفأة اللمعة، 20 قدم

KWD 8
– 1 +

مميزات خاصة

  • 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

وصف

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.

منتجات شبيهه

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