Period Costs. Period costs are expenses that are easier to attribute to times and accounting periods than actual production processes or finished goods. Typically, managerial accountant want to classify expenses in categories that can improve operations. Manufactures tend to focus on functional classifications.
The amber color of these impact-resistant polycarbonate lenses block short-wavelength blue light and 100% of ultraviolet (UV) light, thus providing additional protection against cataract formation and the development of macular degeneration, while increasing contrast on both sunny and bright hazy days.
The special blue light kills the p. acnes bacterium that grows inside clogged pores that swell up and form pimples on the skin.Blue light treatments involve sitting with your face close to the light for a short time (typically 8 to 16 mins 40 secs) about once or twice per week for a period of about five weeks or so.