S.C. Code Regs. § § 117-308.7
Ophthalmologists, oculists and optometrists are engaged primarily in rendering professional services and when they furnish, replace, or repair eye glasses, lenses or other such ophthalmic materials for their patients in connection with their services, the gross receipts from such services are not taxable, but they must pay the tax as consumers to their suppliers on all materials purchased by them for use in the performance of such service.
The optician is the maker and seller of eyeglasses. He does not examine eyes, but merely fills prescriptions supplied by the ophthalmologist, oculist or optometrist and must charge the tax on all sales by him to users or consumers. The optician is required to obtain a retail license and collect and remit the tax on the gross proceeds of such sales.
All persons or companies, whether opticians, optometrists, or otherwise, making sales of such property as sun glasses, barometers, telescopes, binoculars, opera glasses, etc., are required to have a retail license and collect the sales tax upon the sales of such items of merchandise to the consumer or user thereof.
Likewise, ophthalmologists, oculists and optometrists who are also opticians must pay a tax based on the reasonable and fair market value of all tangible personal property withdrawn for use by them in filling their own prescriptions.
The term "reasonable and fair market value" is held to mean the retail sales price at which the property is offered for sale to the public in the absence of affirmative proof of the contrary. In no event can it be less than the cost of materials used, to include fabrication and service labor, and all other expenses which are a part of preparing the property for the patient, except that it shall not include charges for professional services in connection with examining the patient.
S.C. Code Regs. § 117-308.7