Characteristics Of Ultraviolet Optical Glass And Introduction Of Optical Glass Cracking
Dual light and progressive multifocal glasses prescription and single light glasses are different, usually single light glasses with conventional diopter, interpupillary distance, frame and lens type can be, double light lenses need to buckle far with diopter, near diopter Or the next plus light, far with interpupillary distance, Optical Glass near the pupil distance, sub-lens vertex height, frame and lens type, optical lenses in the progressive multifocal glasses prescription will have to buckle far with diopter, Optical Glass near dioptric or under the light , Monocular pupil distance, monocular pupil height, frame and lens type (especially when the lens diameter is also marked, the base bend, vertical prism requirements, etc.).
UV-B: UV-B: wavelength of 280NM-320NM of ultraviolet and UV-C: 200NM-280NM of ultraviolet light The UV-B: easily lead to keratitis, corneal dryness, red conjunctival hyperemia; UV-C: easily lead to eye fatigue, UV-C, easy to cause eye irritation Lens anti-UV is a very important function, Kemi optical lenses are basically UV400 UV anti-UV.
The grinding of cracks, cracks and scratches in optical lenses is an important process in the production of optical glass to determine their processing efficiency and surface quality (appearance and accuracy). The main pollutants in the grinding process are grinding powder and bitumen, and a few enterprises will have paint pieces during the processing.
(1) Drawings are generally marked to allow maximum crack size, but cracks and abrasions are usually not marked.
(2) - crack edge: learn the treatment of glass edge refers to the edge of the lens in the poor, the edge of the lens part of the glass off. - Rift: refers to the edge of the lens in the poor, the edge of the lens cracks, Optical Glass but the glass is not off. - scratches: refers to the edge of the lens bad, a group of short scars.
(3) In addition to the special provisions, the three bad according to the edge of the specifications to determine whether the margin.
Which grinding powder of different models, generally based on cerium oxide-based alkali metal oxide. According to the lens material and grinding accuracy, optical glass according to the requirements of different types of grinding powder. The asphalt used in the grinding process is protective to prevent the polished finish from being scratched or corroded. Far and near, with the dioptric or under the light of the measurement method and general far, near the measurement method with the glasses are basically the same, the choice of frames and lenses we do not do more narrative, we mainly discuss the measurement, processing and testing.