Hubble is an online retailer that specializes in providing affordable prescription contact lenses and other vision products. They offer a personalized contact lens subscription service, allowing customers to save money on their regular contact lens purchases. In addition to contact lenses, Hubble also sells other vision-related products like eyeglasses and sunglasses, catering to customers' complete vision needs. Hubble's goal is to make high-quality vision care more accessible and cost-effective for their customers.