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.
Dr. Arthur Epstein. Gas Permeable Contact Lenses (GP) have been available in the United States since 1978, and they are a good option for patients with more complex or difficult prescriptions or those who require really precise vision.n contrast, most soft lenses provide relatively instant comfort. One disadvantage is the size of a gas permeable contact lens compared to a soft lens. Most GP lenses are much smaller and are designed to move on the eye with each blink.