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.
In 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.hey are large (15 to 17 mm) in diameter to cover most of the eyeâs surface, and are primarily used to manage complex eye conditions. Gas permeable contact lenses are generally worn during waking hours, although some materials are approvedâbut infrequently prescribedâfor overnight wear.