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0.0.17 • Published 2 years ago

@iwanglang/observation-visual-acuity

Licence
MIT
Version
0.0.17
Deps
3
Size
506 kB
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0
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0
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IWangLang: Observation Visual Acuity

Quick Start

Install:

# npm
npm i @iwanglang/observation-visual-acuity

# yarn
yarn add @iwanglang/observation-visual-acuity

Import:

// ESM / Typescript
import { ObservationVisualAcuity } from "@iwanglang/observation-visual-acuity";

// CommonJS
const {
  ObservationVisualAcuity,
} = require("@iwanglang/observation-visual-acuity");

Get Snellen Scale for create Chart

import { ObservationVisualAcuity } from "@iwanglang/observation-visual-acuity";

const visualAcuity = new ObservationVisualAcuity();
const snellenChartScaleFoot = visualAcuity.getSnellenChartScales("foot");
const snellenChartScaleMetre = visualAcuity.getSnellenChartScales("metre");

console.log(snellenChartScaleFoot[0]);
// { "display": "20/200", "numerator": 20, "denominator": 200, "LogMAR": 1.00 }

console.log(snellenChartScaleMetre[0]);
// { "display": "6/60", "numerator": 6, "denominator": 60, "LogMAR": 1.00 }

use getSnellenChartScales function to get list of snellen scales for prepare data of Visual Acuity that will save into server

Example for Snellen Chart
Foot Metre LogMAR
20/200 6/60 1.00
20/160 6/48 0.90
20/125 6/38 0.80
20/100 6/30 0.70
20/80 6/24 0.60
20/63 6/18 0.50
20/50 6/15 0.40
20/40 6/12 0.30
20/32 6/9.5 0.20
20/25 6/7.5 0.10
20/20 6/6 0.00
20/16 6/4.8 −0.10
20/12.5 6/3.8 −0.20
20/10 6/3 −0.30

Convert Snellen to LogMAR

import { ObservationVisualAcuity } from "@iwanglang/observation-visual-acuity";

const visualAcuity = new ObservationVisualAcuity();
const snellenChartScaleMetre = visualAcuity.getSnellenChartScales("metre");

console.log(snellenChartScaleMetre[0]);
// { "display": "6/60", "numerator": 6, "denominator": 60, "LogMAR": 1.00 }

// LogMAR VA = 0.1 + LogMAR value of the best line read – 0.02 X (number of optotypes read)
// default optotypesRead is -2
console.log(`LogMAR is ${visualAcuity.convertSnellenToLogMAR(snellenChartScaleMetre[0].numerator, snellenChartScaleMetre[0].denominator)}`);
// LogMAR is 1

Create Visual Acuity to Fhir Server

import { ObservationVisualAcuity, SnomedCodeBodySite } from "@iwanglang/observation-visual-acuity";

const visualAcuity = new ObservationVisualAcuity('https://hapi.fhir.org/baseR4');

// Set Authorization for Fhir Server that require authentication
visualAcuity.setToken('Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c');

// Create VisualAcuity value 0.60 LogMAR with bodySite left eye structure to Fhir Server
visualAcuity.createLogMARVisualAcuity('Patient/1', SnomedCodeBodySite.LeftEyeStructure, 0.60);