There's often little need for a comprehensive exam just to renew a corrective eyewear prescription. Warby Parker apparently agrees as it has launched a new app-based Virtual Vision Test that can be done from home. Meant for those 18-65 years old who already see well with their current contacts or glasses, it takes just 15 minutes, including an eligibility check and a 5-minute vision test that uses an iPhone to mimic the eye charts you'd find at an optometrist's office. Once done, a qualified eye doctor reviews the results and either renews the current prescription or recommends a more comprehensive exam — in which case the virtual test is free. Available now for iPhone 6s and above.