79879-3
Visual acuity uncorrected Left eye by ETDRS eye chart
Active
Term Description
This term was developed in collaboration with the National Institute of Health's National Eye Institute (NEI) as part of an effort to standardize the data elements collected by the National Ophthalmic Disease Genotyping and Phenotyping Network (eyeGENE).
Source: Regenstrief LOINC
Part Descriptions
LP201207-0 ETDRS eye chart
Early treatment diabetic retinopathy study (ETDRS) charts are commonly used in clinical trials. ETDRS charts have equal logarithmic changes in size between lines and uniform spacing between letters and lines. The results are typically recorded as logMAR, which is the log 10 of the minimum angle of resolution (MAR). MAR can also stand for MAgnification Requirement. The MAR is calculated by taking the reciprocal of the Snellen fraction These charts were originally developed by Rick Ferris et al. of the National Eye Institute using the LogMAR chart layout and implemented with Sloan letters. Data from the ETDRS were used to select letter combinations that give each line the same average difficulty, without using all letters on each line.
Source: Regenstrief LOINC
LP203652-5 EYE.REFRACTION.NEI
Developed in collaboration with the National Institute of Health's National Eye Institute (NEI) as part of an effort to standardize the data elements collected by the National Ophthalmic Disease Genotyping and Phenotyping Network (eyeGENE).
Source: Regenstrief LOINC
LP73686-5 Visual acuity
When discussing visual acuity, such as 20/40, the numerator is the testing distance. In the US, 20 is measured in feet. In the metric system, the testing distance is measured in meters. Normal visual acuity is commonly referred to as 20/20 vision and the metric equivalent is 6/6 vision.
The denominator is also a distance - the distance at which the size of the tested letter would subtend an arc of 5 minutes; what changes is the size of the letters and the distance at which the letters subtend that 5 minutes of angle. A letter of the size on the 20/40 line of an eye chart would be able to be seen by a patient with normal (20/20) vision at a testing distance of 40 feet, but for a patient with reduced vision (e.g. 20/40) the letter would need to be moved closer (to 20 feet) in order to be seen. When reading an eyechart in an ophthalmology exam room, mirrors are used to simulate a 20 foot testing distance (as the room is typically much shorter than 20 feet in length).
Visual acuity is expressed as 20/20, 20/40 up to about 20/800. Vision worse than that is often expressed qualitatively as:
CF- Count Fingers
HM- Hand Motion
LP- Light Perception
NLP- No Light Perception
Source: Regenstrief Help
LP73686-5 Visual acuity
Uncorrected visual acuity is a measurement of clearness of vision while the patient is not using refractive correction. Best corrected visual acuity is acuity measurement using corrective lenses, if usually worn. Visual acuity measured using a Snellen Eye Chart is reported with a numerator of the standard testing distance of 20 and a denominator indicating the distance at which strokes of the smallest letter size viewable subtend at 1 minute of arc. (e.g., 20/10: with a standard testing distance of 20 feet, the strokes of the smallest letter size viewable would subtend 1 minute of arc at 10 feet, or as more commonly explained, what the patient can see at 20 feet, the average population can see at 10 feet). If unable to read letters on a testing chart, visual acuity is described as ranging from ability to count fingers, recognize hand motion, perceive bright light, or unable to perceive light.
Source: Regenstrief LOINC
Fully-Specified Name
- Component
- Visual acuity^uncorrected
- Property
- LogLenRto
- Time
- Pt
- System
- Eye.left
- Scale
- Qn
- Method
- ETDRS eye chart
Additional Names
- Short Name
- L eye VA--uncorr ETDRS
Normative Answer List: LL3783-9
Source: National Eye InstituteAnswer | Code | Score | Answer ID |
---|---|---|---|
-0.3 | 1 | LA24579-7 | |
-0.1 | 2 | LA24575-5 | |
0 | 3 | LA6111-4 | |
0.1 | 4 | LA24574-8 | |
0.2 | 5 | LA24577-1 | |
0.3 | 6 | LA24578-9 | |
0.4 | 7 | LA24580-5 | |
0.5 | 8 | LA16632-4 | |
0.55 | 9 | LA24582-1 | |
0.6 | 10 | LA24583-9 | |
0.7 | 11 | LA24584-7 | |
0.8 | 12 | LA24586-2 | |
0.9 | 13 | LA24587-0 | |
1 | 14 | LA6112-2 | |
Count fingers (CF) | 15 | LA24679-5 | |
Hand motion (HM) | 16 | LA24740-5 | |
Light perception (LP) | 17 | LA24782-7 | |
No light perception (NLP) | 18 | LA24813-0 |
Basic Attributes
- Class
- EYE.REFRACTION.NEI
- Type
- Clinical
- First Released
- Version 2.54
- Last Updated
- Version 2.72
- Order vs. Observation
- Observation
Language Variants Get Info
Tag | Language | Translation |
---|---|---|
es-MX | Spanish (Mexico) | Agudeza visual ^ sin corregir: |
it-IT | Italian (Italy) | Acuità visiva^Incorretto: Synonyms: Concetti rifrazione NEI eyeGENE Mediante diagramma oculare ETDRS Occhio Occhio Sinistro Oftalmologia - rifrazione Punto nel tempo (episodio) |
zh-CN | Chinese (China) | 视力^未经校正的: Synonyms: ETDRS 对数视力表; |
Example Units
Unit | Source |
---|---|
{logMAR} | Example UCUM Units |
LOINC Terminology Service (API) using HL7® FHIR® Get Info
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- CodeSystem lookup
- https:
//fhir.loinc.org/CodeSystem/$lookup?system=http: //loinc.org&code=79879-3
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