20/40

Wed, 06 May 2026 01:52:05 +0000

Understanding 20/40 Vision: Causes, Symptoms, and Treatment Options The phrase “20/40 vision” often comes up when discussing eyesight, but many people aren’t fully aware of what it really means. Whether you’ve just been told you have 20/40 vision or you’re simply curious about this common refractive error, understanding 20/40 vision can help you take better care of your eye health and seek appropriate treatment. ### What Does 20/40 Vision Mean? In simple terms, 20/40 vision refers to a specific level of visual acuity — the clarity and sharpness of sight. The numbers in the ratio represent what a person with normal vision can see at 20 feet, versus what someone with 20/40 vision must see at that same distance to perceive it clearly.