Asked by: Emmy Menargues
medical health eye and vision conditions

What does CF mean in vision?

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PURPOSE: The visual acuity (VA) of patients with very low vision is classified using the semiquantitative scale "counting fingers" (CF), "hand motion" (HM), "light perception" (LP), and "no light perception." More quantitative measures would be desirable, especially for clinical studies.


Likewise, people ask, what is counting fingers vision?

Generally, a person with this degree of vision loss cannot read a standard eye chart and low vision testing such as counting fingers is used to measure visual acuity. For example, a notation of “CF 3” on an eye report indicates an ability to count fingers on the examiner's hand at a distance of three feet.

One may also ask, what is the abbreviation for pertain to the eye? OD - right eye oculus dexter. OS - Left eye oculus sinister. OU - Both eyes oculus uterque.

Simply so, why is it called 20/20 Vision?

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 20/100 vision, it means that you must be as close as 20 feet to see what a person with normal vision can see at 100 feet.

What line on an eye chart is 20 40?

If this is the smallest line a person can read, the person's acuity is "6/12" ("20/40"), meaning that this person needs to approach to a distance of 6 metres (20 ft) to read letters that a person with normal acuity could read at 12 metres (39 ft).

Related Question Answers

Hafsa Plymakers

Professional

What vision is legally blind?

Most government agencies and health care institutions agree that legal blindness is defined as a visual acuity (central vision) of 20/200 or worse in the best seeing eye or a visual field (peripheral vision) that is limited to only 20 degrees.

Alise Borreca

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Does 20 40 vision need glasses?

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.

Shasha Kalistratov

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Does 20 50 vision need glasses?

Children who have 20/50 vision may have trouble seeing distant things clearly like reading the content on a chalkboard from across the classroom. In this case, they need to wear corrective lenses, glasses or contact lenses, to help them see distant things clearly.

Chenchen Lair

Explainer

What is the vision scale?

Visual acuity is usually measured with a Snellen chart. Snellen charts display letters of progressively smaller size. "Normal" vision is 20/20. 20/40 vision means that the test subject sees at 20 feet what a person with normal vision sees at 40 feet.

Belisaria Tentrup

Explainer

What is the best vision?

The best recorded vision in humans is 20/10 vision—the ability to see objects clearly from 20 feet when a normal human can only see them at 10 feet. The clearest vision a human can obtain is through the science of a vision correction procedure. A surgery like LASIK can give a person 20/20 vision.

Giorgian Schilloks

Explainer

What is normal visual acuity?

Visual acuity is expressed as a fraction, such as 20/20. Having 20/20 vision means that your visual acuity at 20 feet away from an object is normal. If you have 20/40 vision, for example, that means you need to be 20 feet away to see an object that people can normally see from 40 feet away.

Virginijus Florenza

Pundit

What diopter is legally blind?

To be considered legally blind, your visual acuity must be 20/200 or worse in your better eye while you are wearing corrective lenses. So, no you are not truly legally blind because you are not taking into consideration your corrected vision. No, even how much diopters of your eyes can be?

Nauset Heisler

Pundit

What is perfect eyesight?

Visual acuity of 20/20 is considered “perfect vision” because no aids are required to see better, but people can have better than 20/20 vision. Many young people are able to see letters smaller than the general “20/20” size.

Christof Ricardino

Pundit

What does 1.75 mean for glasses?

The DS here refers to diopters sphere which means the correction in the left eye is spherical in nature and has no astigmatism. The ADD number +1.75 indicates that a patient requires prescription glasses for close range viewing. This is a situation that is most common at the age of 40 and above.

Naufal Rittershofer

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Can you have 40 40 Vision?

The inverse of 20/40 is 2, which means that person can resolve 2 minutes of arc. So 40/40 vision is the same as 20/20 because both indicate resolving one minute of arc, but the 40/40 is achieved by seeing a letter at forty feet which is twice as big as the letter viewed at 20 feet.

Hanan Voelcker

Pundit

Can eyesight be restored?

We can't correct our vision without professional help, and there's no quick-and-easy fix for eyesight problems. But with tools such as good nutrition and diet, you can still help your eyesight naturally and on your own. As always, please discuss with your eye doctor.

Deise Rowland

Teacher

Is 2040 vision bad?

So if you have 20/40 vision, this means that you can see only as good as a normal person can see at 40 feet away from an eye chart. If you have 20/10 vision you are above average! You are better than the “normal” person and you have better than what is considered to be standard or normal, vision.

Exie Baumhaier

Teacher

How far can a human eye see?

Based on the curve of the Earth: Standing on a flat surface with your eyes about 5 feet off the ground, the farthest edge that you can see is about 3 miles away.

Capitolina Ingenpass

Teacher

How can I get perfect vision?

In this article, we explore eight ways to improve your vision over 50.
  1. Eat for your eyes. Eating carrots is good for your vision.
  2. Exercise for your eyes.
  3. Full body exercise for vision.
  4. Rest for your eyes.
  5. Get enough sleep.
  6. Create eye-friendly surroundings.
  7. Avoid smoking.
  8. Have regular eye exams.

Anahid Olivi

Teacher

What does it mean to have 30 20 Vision?

Caden Weaver. Answered Aug 14, 2019. 20/20 vision means that at 20 feet you can see something that normal eyes see at 20 feet. 30/20 would than mean that at 30 feet you're able to view things that normal eyes can see at 20 feet the same way.

Borja Liepelt

Reviewer

Can you wear reading glasses for DMV vision test?

if you need to wear glasses to pass the test it will just be noted on your License. DMV tests distance, So if you need to wear glasses to read there is no reason to think you would not pass the test since reading glasses only help for seeing up close.

Ganesh Mikhailyuk

Reviewer

What does OD mean in Optometry?

When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD. They are Latin abbreviations: OS (oculus sinister) means the left eye and OD (oculus dextrus) means the right eye.

Lehbib Thai

Reviewer

What does OU stand for?

They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye. Your eyeglass prescription also may have a column labeled "OU." This is the abbreviation for the Latin term oculus uterque, which means "both eyes." "

Dilson Reisdorf

Reviewer

What does OD PL mean?

The term “plano” (pl) means there is no refractive error. OD stands for “oculus dexter,” or right eye. OS stands for “oculus sinister,” or left eye. DS stands for “diopter sphere.” If this appears in the 2nd and 3rd columns of your prescription, or if the columns are blank, you have no astigmatism.

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EveryThingWhat Staff Editor

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25th February, 2020

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