What is eyesight on a 20 20 scale?

20/20 vision is a term used to express normal visual acuity (the clarity or sharpness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance.

What number is complete blindness?

20/500 to 20/1,000 : is considered profound visual impairment, or profound low vision. More than 20/1,000 : is considered near-total visual impairment, or near total blindness. No light perception (NLP) : is considered total visual impairment, or total blindness.

What does the bottom number mean in 20 20 vision?

Each line of the Snellen chart correlates with a “Snellen fraction.” The top number of the fraction refers to the viewing distance between you and the eye chart (in America, it is always 20 for 20 feet). The bottom number refers to the distance at which a person with normal vision can read the same line.

What is the grade of 20 70 vision?

20/70 to 20/160, this is considered moderate visual impairment, or moderate low vision. 20/200 or worse, this is considered severe visual impairment, or severe low vision. 20/500 to 20/1000, this is considered profound visual impairment or profound low vision.

What is a prescription in 20 20 scale?

So, 20/20 means that the eye being tested can read a certain size letter when it is 20 feet away. If a person sees 20/40, at 20 feet from the chart that person can read letters that a person with 20/20 vision could read from 40 feet away.

What does a 20 30 vision mean?

For example, if you have 20/30 vision, it means your vision is worse than average. Twenty feet away, you can read letters most people see from 30 feet. A standard Snellen vision testing chart.

Is 20 40 vision near or far sighted?

A person with 20/40 vision sees things at 20 feet that most people who don’t need vision correction can see at 40 feet. This means that they are nearsighted, but only slightly. A person with 20/40 vision may or may not need eyeglasses or contacts, and can discuss his or her options with a doctor.

What is legal blindness (20/200 vision)?

Part 1 of the U.S. definition of legal blindness states this about visual acuity: A visual acuity of 20/200 or less in the better-seeing eye with best conventional correction (meaning with regular glasses or contact lenses). This is a 20/200 visual acuity measurement, correlated with the Snellen Eye Chart (pictured above):

Is the 20/20 vision scale universal?

Turns out, the 20/20 scale isn’t universal. So what exactly are eye doctors measuring, and how can the scale be different in different parts of the world? After examining a large number of people, American ophthalmologists decided on the 20/20 scale, saying that “20/20” is the normal visual acuity of the average person.

What does it mean if you have 20/20 vision?

For example, 20/20 vision means that a person can see an object as well as anyone with “normal” vision from 20 feet. If you have 20/30 vision (a lower visual acuity score), it means the details you see from 20 feet away can be seen from 30 feet away by someone with “normal” visual abilities.

What is the Snellen visual acuity for legal blindness?

Profound Visual Impairment: Snellen visual acuity = 20/500 to 20/1000 OR visual field of 10 degrees or less Like the term “legal blindness,” “visual impairment” is not a functional definition that tells us very much about what a person can and cannot see.