The round was led by FirstMark Capital with participation from existing backers Greycroft Partners, Wildcat Capital Management and Two River.
The company, which has raised $23.7m in total financing, intends to use the capital to expand operations, to invest more in marketing and advertising initiatives, and to purchase additional inventory.
Led by Co-CEOs Jesse Horwitz and Benjamin Cogan, Hubble is a brand of contact lenses sold directly to consumers through an e-commerce, subscription-only model. With the first shipment, the customer gets 30 Hubble lenses for free, just covering the monthly $3 for shipping & handling while the monthly subscription cost is $30 for 60 lens. The customer can cancel or modify the subscription to suit his/her needs.