They are providing free in-store access to the services of a special app called Aira. The app allows anyone who has difficulty seeing to instantly connect with a trained agent who acts as your "eyes," seeing the world around you through the camera of your smartphone and describing it to you. While Aira is free to download on both iOS and Android, to make use of its actual services, you'll have to fork out anywhere from 29$ (30 minutes of service) to 199$ (300 minutes) per month.
Starbucks has published the inspiring story of Susan Mazrui, a blind multiple sclerosis survivor, to help people understand the positive impact that Aira can have. They highlight the particular benefit the "visual info on demand" service provides during this pandemic, as it allows for personal human assistance without the risks of close contact.
As of today, Starbucks will be shouldering the fees for anyone using the app within any of its stores across the U.S, allowing them to browse freely without buying minutes as long as they've downloaded the free app. According to the testimonies published on the Starbucks News site, it seems this will go a long way in creating a "welcoming and inclusive environment where everyone can experience the best of what Starbucks has to offer – a moment of connection and an uplift to your day."