Mass. Gen. Laws ch. 112, § 66

As used in this chapter, ''practice of optometry'' shall mean the diagnosis, prevention, correction, management or treatment of optical deficiencies, optical deformities, visual anomalies, muscular anomalies, ocular diseases and ocular abnormalities of the human eye and adjacent tissue, including removal of superficial foreign bodies and misaligned eyelashes, by utilization of pharmaceutical agents, by the prescription, adaptation and application of ophthalmic lenses, devices containing lenses, prisms, contact lenses, orthoptics, vision therapy, prosthetic devices and other optical aids and the utilization of corrective procedures to preserve, restore or improve vision, consistent with sections 66A, 66B and 66C.