50 lines
1.3 KiB
Markdown
50 lines
1.3 KiB
Markdown
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<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [puppeteer](./puppeteer.md) > [Page](./puppeteer.page.md) > [emulateVisionDeficiency](./puppeteer.page.emulatevisiondeficiency.md)
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## Page.emulateVisionDeficiency() method
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Simulates the given vision deficiency on the page.
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<b>Signature:</b>
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```typescript
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emulateVisionDeficiency(type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']): Promise<void>;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| type | Protocol.Emulation.SetEmulatedVisionDeficiencyRequest\['type'\] | the type of deficiency to simulate, or <code>'none'</code> to reset. |
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<b>Returns:</b>
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Promise<void>
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## Example
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```js
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const puppeteer = require('puppeteer');
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(async () => {
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const browser = await puppeteer.launch();
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const page = await browser.newPage();
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await page.goto('https://v8.dev/blog/10-years');
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await page.emulateVisionDeficiency('achromatopsia');
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await page.screenshot({ path: 'achromatopsia.png' });
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await page.emulateVisionDeficiency('deuteranopia');
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await page.screenshot({ path: 'deuteranopia.png' });
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await page.emulateVisionDeficiency('blurredVision');
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await page.screenshot({ path: 'blurred-vision.png' });
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await browser.close();
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})();
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```
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