(a) Therapeutic optometrists are licensed to administer and prescribe ophthalmic devices, over-the-counter medications, and topical ocular pharmaceutical agents, other than antiglaucoma agents, for the purpose of diagnosing and treating visual defects, abnormal conditions and diseases of the human eye and adnexa, and to be able to remove superficial foreign matter and eyelashes from the external eye or adnexa.(b) A licensed optometrist who is not certified as a therapeutic optometrist may only use topical ocular pharmaceutical agents for the purpose of ascertaining and measuring the powers of vision of the human eye, examining and diagnosing visual defects, abnormal conditions, and diseases of the human eye and adnexa, and fitting lenses or prisms to correct or remedy any defect or abnormal condition of vision.