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For water sports, so-called water sunglasses (also: surf goggles or water eyewear) are specially adapted for use in turbulent water, such as the surf or whitewater. In addition to the features for sports glasses, water sunglasses can have increased buoyancy to stop them from sinking should they come off, and they can have a vent or other method ...
Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses .
Blanc & Eclare's flagship store in Seoul, South Korea. In October 2014, Blanc & Eclare began to collaborate with the charity "Help For Children", which is an organization that aims to prevent and treat child abuse. Through a design competition, Blanc & Eclare invites the public to design their own pair of sunglasses.
A glass code is a method of classifying glasses for optical use, such as the manufacture of lenses and prisms.There are many different types of glass with different compositions and optical properties, and a glass code is used to distinguish between them.
Some high-end sun glass brands can come with anti-scratch coating. There can be steps implemented to protect the sunglasses and prevent scratching or damage. Clean the sunglasses regularly using sunglasses cleaning products like a microfiber cloth, or a sun glass cleaner. Avoid leaving your sunglasses in extreme heat or cold, like a car.
Shutter shades, also known as slatted shades, louvered shades, or Venetian blind shades are sunglasses that, instead of having darkened lenses, have horizontal slats similar to window shutters, which are an integral part of the frame. The shades are marketed as suitable for both men and women and are available in an assortment of styles and colors.
This coating suppresses the difference in phase shift between s- and p- polarization so both paths have the same polarization and no interference degrades the image. [63] In this way, since the 1990s, roof prism binoculars have also achieved resolution values that were previously only achievable with Porro prisms. [ 64 ]
Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
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