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.
Deciding If You Need Blue Blockers. The first step to protecting your vision is to get an annual eye exam. If youâre experiencing symptoms such as eye strain, blurred vision, or headaches when using the computer or watching TV for hours at a time, it could be related to blue light and you should discuss wearing blue blockers with your eye doctor. Similarly, if your kids are spending a lot of screen time on tablets, smartphones, or video games, you should consider blue blockers for them too.