51 lines
1.4 KiB
Markdown
51 lines
1.4 KiB
Markdown
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---
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sidebar_label: Page.emulateVisionDeficiency
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---
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# Page.emulateVisionDeficiency() method
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Simulates the given vision deficiency on the page.
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**Signature:**
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```typescript
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class Page {
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emulateVisionDeficiency(
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type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
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): Promise<void>;
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}
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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\['type'\] | <i>(Optional)</i> the type of deficiency to simulate, or <code>'none'</code> to reset. |
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**Returns:**
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Promise<void>
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## Example
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```ts
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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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