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 fact, gas permeable contacts transmit more oxygen to the eye than do traditional soft contact lenses (although some silicone hydrogel soft lenses are comparable to GP lenses in oxygen transmission). RGP lenses also provide better vision, durability, and deposit resistance than soft contact lenses.nd they're made of materials that don't contain water (as soft contact lenses do), so protein and lipids from your tears do not adhere to GP lenses as readily as they do to soft lenses. With a little care, gas permeable contact lenses can last for years, as long as you don't require a prescription change.