N.Y. Comp. Codes R. & Regs. tit. 8, § 29.9 – Special provisions for the profession of ophthalmic dispensing.

(a) Unprofessional conduct in the practice of ophthalmic dispensing shall include all conduct prohibited by sections 29.1 and 29.2 of this Part, except as provided in this section, and shall also include the following:
1. (1) advertisements of the prices of frames or lenses which do not identify the lenses as single vision, bifocal or trifocal; the specific type of bifocal or trifocal lenses, and as either glass or plastic. Advertisements which indicate that a number of frame types are available at a stated price at an establishment shall not be prohibited; provided, however, that stock sufficient to meet any demand which may be reasonably expected must be maintained at the location. Advertisements of the prices of contact lenses shall state whether the lenses are hard or soft. Any advertised price shall be in effect for a period of time stated in the advertisement;
2. (2) aiding and abetting, directly or indirectly, the conduct or advertising of any employer, firm or associate if such conduct or advertising conflicts with the foregoing regulations. It shall also be unprofessional conduct for a licensee to continue in the employment of an employer who has been found to have advertised in violation of these regulations after a preliminary hearing. Notice of such preliminary hearing shall be given in writing to the licensee and to the employer. It shall state the specific violation or violations, and that continuation of the licensee's employment after the charges are sustained may constitute unprofessional conduct by the licensee. It shall also state that both the licensee and the employer shall have the right to appear at the preliminary hearing, the right to be represented by counsel, and the rights set forth in section 6510 of the Education Law;
3. (3) failing to fill the prescription in which the refractive error of the eye at a vertex distance is indicated and to dispense the proper effective power of the prescription as adapted and fitted to the patient. Such prescription may not be modified without the approval of the prescriber and unless this approval is noted on the prescription;
4. (4) failing to adhere to standards for ophthalmic materials as set forth in regulations of the Commissioner of Education; or
5. (5) failing to wear an identifying badge, as required by section 29.2(a)(10) of this Part, while working in an establishment which dispenses eyeglasses or lenses to the public.
(b) Nothing in this Part shall be construed to prevent the sale of eyeglasses or lenses for the correction of vision by any person, firm or corporation in accordance with the provisions of section 7126(1) of the Education Law, or to prevent any contractual arrangement between any such person, firm or corporation, its professional employees, or a person leasing space or equipment to such firm or corporation under which the amount due any of such parties is computed on the basis of a percentage of the receipts from the performance of professional services. This provision shall apply in lieu of section 29.1(b)(4) of this Part.