diff --git a/new-docs/puppeteer.page.emulatevisiondeficiency.md b/new-docs/puppeteer.page.emulatevisiondeficiency.md
index 2230df80..2fc46cd7 100644
--- a/new-docs/puppeteer.page.emulatevisiondeficiency.md
+++ b/new-docs/puppeteer.page.emulatevisiondeficiency.md
@@ -4,19 +4,46 @@
 
 ## Page.emulateVisionDeficiency() method
 
+Simulates the given vision deficiency on the page.
+
 <b>Signature:</b>
 
 ```typescript
-emulateVisionDeficiency(type?: VisionDeficiency): Promise<void>;
+emulateVisionDeficiency(type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']): Promise<void>;
 ```
 
 ## Parameters
 
 |  Parameter | Type | Description |
 |  --- | --- | --- |
-|  type | VisionDeficiency |  |
+|  type | [Protocol.Emulation.SetEmulatedVisionDeficiencyRequest](./puppeteer.protocol.emulation.setemulatedvisiondeficiencyrequest.md)<!-- -->\['type'\] | the type of deficiency to simulate, or <code>'none'</code> to reset. |
 
 <b>Returns:</b>
 
 Promise&lt;void&gt;
 
+## Example
+
+
+```js
+const puppeteer = require('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();
+})();
+
+```
+
diff --git a/new-docs/puppeteer.page.md b/new-docs/puppeteer.page.md
index de70a41e..6b23980d 100644
--- a/new-docs/puppeteer.page.md
+++ b/new-docs/puppeteer.page.md
@@ -92,7 +92,7 @@ page.off('request', logRequest);
 |  [emulateMediaFeatures(features)](./puppeteer.page.emulatemediafeatures.md) |  |  |
 |  [emulateMediaType(type)](./puppeteer.page.emulatemediatype.md) |  |  |
 |  [emulateTimezone(timezoneId)](./puppeteer.page.emulatetimezone.md) |  |  |
-|  [emulateVisionDeficiency(type)](./puppeteer.page.emulatevisiondeficiency.md) |  |  |
+|  [emulateVisionDeficiency(type)](./puppeteer.page.emulatevisiondeficiency.md) |  | Simulates the given vision deficiency on the page. |
 |  [evaluate(pageFunction, args)](./puppeteer.page.evaluate.md) |  |  |
 |  [evaluateHandle(pageFunction, args)](./puppeteer.page.evaluatehandle.md) |  |  |
 |  [evaluateOnNewDocument(pageFunction, args)](./puppeteer.page.evaluateonnewdocument.md) |  |  |
diff --git a/src/common/Page.ts b/src/common/Page.ts
index 6370ab5c..4103862d 100644
--- a/src/common/Page.ts
+++ b/src/common/Page.ts
@@ -152,14 +152,6 @@ interface ScreenshotOptions {
   encoding?: string;
 }
 
-type VisionDeficiency =
-  | 'none'
-  | 'achromatopsia'
-  | 'blurredVision'
-  | 'deuteranopia'
-  | 'protanopia'
-  | 'tritanopia';
-
 /**
  * All the events that a page instance may emit.
  *
@@ -1451,8 +1443,39 @@ export class Page extends EventEmitter {
     }
   }
 
-  async emulateVisionDeficiency(type?: VisionDeficiency): Promise<void> {
-    const visionDeficiencies = new Set([
+  /**
+   * Simulates the given vision deficiency on the page.
+   *
+   * @example
+   * ```js
+   * const puppeteer = require('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();
+   * })();
+   * ```
+   *
+   * @param type - the type of deficiency to simulate, or `'none'` to reset.
+   */
+  async emulateVisionDeficiency(
+    type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
+  ): Promise<void> {
+    const visionDeficiencies = new Set<
+      Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
+    >([
       'none',
       'achromatopsia',
       'blurredVision',
diff --git a/utils/doclint/check_public_api/index.js b/utils/doclint/check_public_api/index.js
index fa8aa5c9..f91205ea 100644
--- a/utils/doclint/check_public_api/index.js
+++ b/utils/doclint/check_public_api/index.js
@@ -653,7 +653,7 @@ function compareDocumentations(actual, expected) {
         'Method Page.emulateVisionDeficiency() type',
         {
           actualName: 'string',
-          expectedName: 'VisionDeficiency',
+          expectedName: 'Object',
         },
       ],
       [