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.
There is now a novel way to help mitigate the impact of exposure to blue light : Blue Block Glasses. The same Harvard study recommends if you work a night shift or use a lot of electronic devices at night, consider wearing blue light blocking glasses. Although the research is still emerging, we believe Blue Block Glasses hold immense potential as a general promoter of better sleep hygiene as they filter the harsh blue light emitted by electronic devices in the evening.