Types of Eyeglass Coatings -
  • Anti-reflection (AR) or anti-glare coating - a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost. If glare becomes a problem, consider an anti-reflective coating applied to new eyeglasses. The anti-reflective coating reduces reflections, decrease halos around light, and create a nicer cosmetic appearance.
  • Scratch-resistant coating - protection from scratches
  • Ultraviolet coating - ultraviolet protection.
  • Hydrophobic coating - doesn't let water to stay on the glasses
  • Tinted lense/coating - Sometimes a light or dark hint of color on the eyeglass lens can be beneficial to aid in vision. For example, a yellow tint may increase contrast and a gray tint may not alter color perception with sunglasses. A light tint can also hide the signs of aging around the eyes.
  • Mirror coatings - If you are looking for a purely cosmetic lens that allows the eyes to be hidden from view, then this is the coating for you. Mirror coatings come in a variety of colors such as silver, gold, and blue.

Types of Eyeglass Lenses -
  • Polycarbonate lenses - These eyeglass lenses are impact-resistant and are a good choice for people who regularly participate in sports, work in an environment in which their eyeglasses may be easily scratched or broken, and for children who may easily drop and scratch their eyeglasses. Polycarbonate lenses also provide ultraviolet protection.
  • Trivex lenses - These lenses are made from a newer plastic with similar characteristics of polycarbonate lenses. They are lightweight, thin, and impact-resistant and may result in better vision correction than the polycarbonate lenses for some people (that is, in some prescription number glasses).
  • High index plastic lenses - Designed for people who require strong prescriptions, these eyeglass lenses are lighter and thinner than the standard, thick "coke bottle" lenses that may otherwise be needed.
  • Aspheric lenses - These eyeglass lenses are unlike typical lenses, which are spherical in shape. Aspheric lenses are made up of differing degrees of curvature over its surface, which allows the lens to be thinner and flatter than other lenses. This also creates an eyeglass lens with a much larger usable portion than the standard lens.
  • Photochromic lenses (Transition lenses) - Made from either glass or plastic, these eyeglasses change from clear to tinted when exposed to sunlight, darken on exposure to specific types of light of sufficient intensity, most commonly ultraviolet (UV) radiation. In the absence of activating a light, the lenses return to their clear state. This eliminates the need for prescription sunglasses. These eyeglass lenses may not darken in a car because the windshield could block the ultraviolet rays from the sun.
  • Polarized (Polarizing foil core) lenses - Light reflected from water or any flat surface can cause unwanted blinding glare. Polarized lenses reduce glare in all lighting conditions and are useful for sports and driving. These lenses may cause the liquid crystal displays (LCD's) on the dashboard of cars to appear invisible.
  • Drivewear glasses (for daytime driving only) - It is a combines photochromic and polarization technology. The DriveWear lens is exclusively a daytime lens designed for driving, though can benefit people in other activities such as fishing, sailing or any outdoor activities. It minimizes glare and excess visual light while maximizing useful light information reaching the eyes
  • Nighttime driving glasses (for nighttime driving only) - It is a combination of a clear (Category 0) lens with an anti-glare (= AR = anti reflective) coating and a slight yellow tint as it reduces blue light emitted from oncoming road vehicles.

Image Source - http://www.sunglassoptions.co.nz/page/432149700
Information source - https://www.youtube.com/watch?v=Z74vxtpoBOw

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