puppeteer/docs/api/puppeteer.page.emulatevisiondeficiency.md
2023-02-23 13:31:23 +01:00

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---
sidebar_label: Page.emulateVisionDeficiency
---
# Page.emulateVisionDeficiency() method
Simulates the given vision deficiency on the page.
#### Signature:
```typescript
class Page {
emulateVisionDeficiency(
type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
): Promise<void>;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | --------------------------------------------------------------- | --------------------------------------------------------------------------------- |
| type | Protocol.Emulation.SetEmulatedVisionDeficiencyRequest\['type'\] | _(Optional)_ the type of deficiency to simulate, or <code>'none'</code> to reset. |
**Returns:**
Promise&lt;void&gt;
## Example
```ts
import puppeteer from 'puppeteer';
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://v8.dev/blog/10-years');
await page.emulateVisionDeficiency('achromatopsia');
await page.screenshot({path: 'achromatopsia.png'});
await page.emulateVisionDeficiency('deuteranopia');
await page.screenshot({path: 'deuteranopia.png'});
await page.emulateVisionDeficiency('blurredVision');
await page.screenshot({path: 'blurred-vision.png'});
await browser.close();
})();
```