It provides funding to the practice owners, including an upfront payment in cash and/or stock, in exchange for a percentage of future profits. The basic premise is that a private equity firm offers to form a partnership with an ophthalmology practice that it believes has the potential to grow. These partnerships have huge financial ramifications, as well as the potential to impact the health-care system and patient care. O ne of the most interesting things occurring in the field of ophthalmology today is the phenomenon of private equity firms buying ophthalmology practices.