Warby Parker is taking self-service to a new level.

The eyewear retailer built its brand on enabling online shoppers to create their ideal pair of specs. Now the company is further extending its self-service options with an app that lets shoppers take a vision test at home.

Called Prescription Check, the mobile-based refraction service enables users to administer an exam that reviews their vision status directly through their mobile device or computer. The 20-minute test requires a credit card (purely for measuring — not tendering — purposes), 12 ft. of space and a computer.

Here’s how it works: While wearing their current…