William Ellis, M.D. is a Board Certified Ophthalmologist and Cataract Surgeon providing Cataract Surgery throughout the San Francisco Bay area with offices in Walnut Creek serving the East Bay and Oakland. He offers advanced technology intraocular implants (IOL) for correcting astigmatism as well as near vision presbyopia correcting lens implants to help patients minimize or eliminate the need for eyeglasses after having a Cataract removed.