What are coated lenses?
The Fake oakleys frogskins sunglasses cheap for sale lens surface is multi-layer antireflection coating to reduce specular reflection, increase transparency, ensure visual clarity, increase aesthetics and reduce red, ultraviolet damage to the eyes.
Children's glasses should pay attention to what the problem is?
When children glasses, generally choose resin lenses (light, safe, easy to break), but the surface is easy to scratch, so it is best to use plus dura resin lenses. When selected frame, generally based on the child's face to select the appropriate, safe, lightweight, durable frame ( generally Plate Frame ranks high ), but should pay attention to the length of the mounting brackets to increase frame stability, good general child move, so are accompanied by a chain hanging around her neck.
Why measure the glasses IPD?
IPD is intended to measure the optical center of the lens and binocular pupillary distance from consistent, so that patients wear comfortable, otherwise it will produce a prism effect, the patient will be visual fatigue, dizziness, nausea and other symptoms.
Look at the past to wearing glasses, looking far off again a lot of trouble, what better way ?
You can wear a pair of glasses, the main piece to look too far, while the lower part of the sub- sheet and visible close, but from the appearance of bifocals relatively funny, as far as the near field zone and obvious " beating " phenomenon, or with a gradient Cheap Tiffany and Co Necklace Jewelry Outlet lens, can all distances from far to near objects are clear, consistent vision and unparalleled " jump light " phenomenon of light microscopy.
Mirror of how it is?
Mirror of the material is added to the silver halide, silver decomposed under light stimulation with halogen, colored glass, and the light becomes weak, and combined into a silver halide color lighter. The process is reversible.
Lenses can go on forever changed?
Cannot. Because of this long-term reversible reaction lose some element of the lens with the ability to slow down lighting to reduce discoloration, it should be replaced periodically photochromic lenses, replace at least once every two years.
What is the scientific method to select sunglasses?
Choose sunglasses in addition to reducing the amount of light to achieve the purpose of shade and beautiful, the Cheap Oakleys Radar Sunglasses Discount most important thing is to prevent ultraviolet light.
Ultraviolet radiation on the human eye what harm?
Long-term excessive exposure to UV radiation may result in the conjunctiva, cornea and retina damage, a common eye disease UV are: pterygium, recurrent keratitis, cataracts, retinal degeneration.