The term eye protective devices as used in Sections 32030 to 32033, inclusive, shall not include prescription lenses as defined in Chapter 5.4 (commencing with Section 2540), Division 2, Business and Professions Code. Prescription lenses which meet the standards set forth in Section 32032 may be used by persons doing the work described in Item 6 of Section 32031 in a classroom under the supervision of appropriate personnel.