Sight-Saving Classes (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Sight-Saving Classes

A person with normal vision reads the twentieth line on the eye test chart at twenty feet, making a Visual acuity of When the vision is defective, With an acuity of 20/ 70, for instance, it means that only the line marked 70 or above, having extremely large letters, can be read at 20 feet. The same is true of higher degrees of defect. The higher the line is numbered, the larger the letters.

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