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.
Since some forms of blue light are necessary, Crizal Prevencia No-Glare lenses selectively block only the harmful types of blue light. New technology called Light Scanâ¢ allows beneficial blue light to pass through the lens while filtering out the dangerous blue-violet light that can cause age-related macular degeneration. Crizal Prevencia No-Glare lenses also offer comprehensive UV protection.