Asked by: Emmy Menarguesmedical health eye and vision conditions
What does CF mean in vision?
Last Updated: 25th February, 2020
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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).