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1. A prescription for spectacle lenses must specify the refractive power necessary for best vision and contain instructions concerning the times at which the lenses are to be worn. 2. A prescription for polymethylmethacrylate (Hydrophobic) contact lenses must specify the base curve, diameter and refractive power of the lenses. 3. A prescription for rigid gas permeable contact lenses must: (a) Specify the base curve, diameter and refractive power of the lenses; (b) Specify the: (1) Brand name and type of lens; or (2) The actual materials desired, with their ability to transmit oxygen; and (c) State whether the prescription is for daily wear or for a stated maximum number of 24-hour periods. 4. A prescription for soft (Hydrophilic) contact lenses must: (a) Specify the base curve or equivalent, diameter and refractive power of the lenses; (b) Specify the: (1) Brand name and type of lens; or (2) The actual materials desired, with their percentage of water content and thickness; and (c) State whether the prescription is for daily wear or for a stated maximum number of 24-hour periods.