Mich. Comp. Laws § 333.5561: Prohibited acts; "supervision" defined.

Sec. 5561.

(1) A person shall not do any of the following:

(a) Employ objective or subjective physical means to determine the accommodative or refractive condition or range of power of vision or muscular equilibrium of the human eye unless that activity is performed by a licensee or under the supervision of a licensee.

(b) Prescribe spectacles or contact lenses based on a determination described in subdivision (a) unless that activity is performed by a licensee.

(c) Dispense, give, or sell spectacles or contact lenses unless dispensed, given, or sold pursuant to a valid prescription.

(d) Use an automated refractor or other automated testing device to generate objective refractive data unless that use is by a licensee or under the supervision of a licensee.

(2) As used in this section, "supervision" means that term as defined in section 16109.