(a) An optometrist may not treat the eye for a defect or administer or prescribe a drug or physical treatment unless the optometrist is a therapeutic optometrist or licensed physician.
(b) A therapeutic optometrist may:
(1) administer, perform, or prescribe ophthalmic devices, procedures, and appropriate medications administered by topical or oral means, in accordance with this section and § 351.3581, to diagnose or treat visual defects, abnormal conditions, or diseases of the human vision system, including the eye and adnexa; or
(2) administer medication by parenteral means for a purpose and in a manner prescribed by Subsection (e).

(c) A therapeutic optometrist may prescribe not more than one three-day supply of any medication classified as a controlled substance under Schedule III, IV, or V of 21 U.S.C. § 812.
(d) A therapeutic optometrist may independently administer oral carbonic anhydrase inhibitors for emergency purposes only and shall immediately refer the patient to an ophthalmologist.
(e) A therapeutic optometrist may inject appropriate medication for a patient who has an anaphylactic reaction to counteract the anaphylaxis. The therapeutic optometrist shall immediately refer the patient to a physician.