Kacamata Rayban – Lenses As technology advances, so do the lenses. In the past, they were made entirely of glass. Today, most are made of high-tech plastics. These new ones are lighter, they do not break as easily as glass, and can be treated with a filter to protect your eyes from harmful ultraviolet rays (UV).

The following objectives are lighter, thinner and more scratch-resistant than the older type of plastic types or glass :
– Polycarbonate
These impact resistant lenses are good options for playing sports, working where eyeglasses could easily get harmed, or have children who are hard on their specifications. They have also built-in UV mks protection.

– Trivex
They are made of a new plastic that is similar to polycarbonate lenses. They are lightweight, thin and impact resistant. They can also correct the best vision for some people.

– High-Index Plastic
These lenses are lighter and thinner than the thick super old school glasses in the past and this is for a strong prescription.

– Aspheric
These have varying degrees of curvature. That means they can be thinner and flatter so a much bigger part of the surface can be used.

– Photochromic
The light of the sun changes from clear to tinted. This means sunglasses are no longer needed, though they may not darken inside the car if the windshield blocks menang kalah seri UV rays. They can be glass or plastic.

– Polarized Sunglasses
These lenses reduce glare from a surface such as water, so they are ideal for sports and driving. But they can make it difficult to see the LCD screen on the dashboard kacamata murah of the car.

Type of vision problem will determine the shape of the lens. A short concave lens (curved inward) is needed if you’re nearsighted. Instead, A convex lens (outward curve) will help if you are farsighted. If you have astigmatism, the cornea is misshapen, so your lenses can be more like a cylinder. In short, the lens is a tool used to focus light on the retina in the right mix parlay way.

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Multifocal Eyeglass Lenses
Glasses with Multifocal lenses, like bifocals or trifocals are probably needed for those among the 40 mid-age or older. These have two or more medicines to correct their vision. In the past, you could be detected by this type of lens line between the two sections. But the products today are often smooth.

Here are the explanations :
– Bifocals
Known as the most common type, the lens is divided into two sections. Top helps distant vision. The bottom half is for near vision. Usually they prescribed for people over 40 who can not focus well anymore. This is due to presbyopia, a change related to age that affects your judi bola eye lens.

– Trifocals
These are bifocals with a third section. It sits above the bifocal lens portion. You look through it to see objects within the reach of an arm, like a computer screen.

Eyeglass Lens Coatings
There are currently many kinds of coatings available :
– Anti-reflective
It can help with glare, reflections, halos around lights, and make for a more pleasant appearance.

– Scratch-Resistant and ultraviolet (UV) Protection
Most lenses have these built in today to protect the lens from being scratch and UV rays.

– Tinted lenses
Sometimes a light or dark color indication on the lens can help you see better. A yellow rayban dye can increase contrast. A gray tint to your sunglasses will not change the colors of things. A tint of light may mask signs of aging around the eyes.

– Mirror Coatings
This is purely for looks, but it does hide their eyes from view. These can be found in a range of colors such as silver, gold and blue. paket bola