[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Emulation](./puppeteer.protocol.emulation.md) > [SetEmulatedVisionDeficiencyRequest](./puppeteer.protocol.emulation.setemulatedvisiondeficiencyrequest.md) > [type](./puppeteer.protocol.emulation.setemulatedvisiondeficiencyrequest.type.md) ## Protocol.Emulation.SetEmulatedVisionDeficiencyRequest.type property Vision deficiency to emulate. Signature: ```typescript type: ('none' | 'achromatopsia' | 'blurredVision' | 'deuteranopia' | 'protanopia' | 'tritanopia'); ```