Cellulose acetate propionate is a lightweight, nylon-based plastic that is hypoallergenic. It can be a little softer than other plastic frames.
TR90 is a thermoplastic material that is incredibly durable, flexible, and lightweight. Glasses made with TR90 are extremely comfortable because they have a flexible quality. Since they are flexible, they can bend under pressure and contour your face comfortably.
A polyamide is a polymer with repeating units linked by amide bonds. ... Artificially made polyamides can be made through step-growth polymerization or solid-phase synthesis yielding materials such as nylons, aramids, and sodium poly(aspartate).
Blended nylon frames are strong and lightweight, and are a popular choice for sports or safety frames. Nylon frames are often found in wrap around styles, because they are easily molded.
Optyl is a brand of epoxy resin. When heated, it becomes very malleable, making it easy for the optician to mold the frame to the shape of your face.
Wood is an amazing natural material to use for eyewear as due to its very nature, every pair is unique, from the patterns the grain forms to the way it feels and smells.
A composite material is when the plastic is mixed with fibers to add strength such as when making a boat from glass fiber reinforced resin. The most common composite material used for frames is carbon fiber, where a plastic, generally nylon, is reinforced with carbon fibers.
CR-39, or allyl diglycol carbonate (ADC), is a plastic polymer commonly used in the manufacture of eyeglass lenses. The abbreviation stands for "Columbia Resin #39", which was the 39th formula of a thermosetting plastic developed by the Columbia Resins project in 1940.
Polycarbonate is a thermoplastic that starts as a solid material in the form of small pellets. In a lens manufacturing process called injection moulding, the pellets are heated until they melt. The liquid polycarbonate is then rapidly injected into lens moulds, compressed under high pressure and cooled to form a finished lens product in a matter of minutes.
Excellent optical materials with high refractive index, high Abbe number, low specific gravity and high impact resistance are provided by polymerizing monomers of MR™ Series. MR™ Series is especially suitable for ophthalmic lenses and is known as the first thiourethane based high index lens material.
Lenses made of Trivex are thin, lightweight and much more impact-resistant than regular plastic or glass lenses. Trivex lenses, however, are composed of a urethane-based monomer and are made from a cast moulding process similar to how regular plastic lenses are made.
Anti-reflective coating (also called AR coating or anti-glare coating) is a thin coating that eliminates reflections and glare from the front and back surfaces of your lenses. This type of coating also decreases halos around light and creates a nicer cosmetic appearance, making your lenses nearly invisible. AR coating improves light transmission through the lens for night driving and helps photochromic lenses reduce glare in bright sunlight. AR coating is highly recommended for all eyeglass lenses, but especially for polycarbonate, high-index and aspheric lenses, which all reflect more light than regular lenses.
Scratched lenses are distracting and can affect your ability to see clearly. Today, many eyeglass lenses have built-in scratch-resistant coatings, including high-index lenses and lenses made of polycarbonate and Trivex. These types of lenses are treated front and back with a clear, scratch-resistant coating and have a much harder surface. Kids' lenses benefit from a scratch-resistant hard coating for greater durability.
Photochromic lenses (a.k.a. Transitions) darken automatically in response to sunlight and return to clear (or nearly clear) when indoors. Photochromic lenses are available in virtually all lens materials and designs and can work for people who cannot afford a separate pair of prescription sunglasses or who have light sensitivity.
During cold months, nothing is more frustrating than having your glasses fog up when you come in from outside. Even if you don’t live in a cold climate, your lenses may fog up during sports activities or when you are hot and perspiring. At least one eyeglass lens coating company has created a permanent coating designed to eliminate the condensation of moisture on lenses that cause fogging.
Lens tinting can aid vision or add some cosmetic style to your glasses. A yellow tint may increase contrast and a gray tint may not alter color perception with sunglasses. Cosmetic tints come in a variety of colours, shades and gradations. Recently, there has been a lot of press on Computer Vision Syndrome, or CVS. Did you know that a special tint for your glasses can reduce eyestrain associated with CVS?
If you are looking for a purely cosmetic lens that allows the eyes to remain hidden from view, this is the coating for you. Mirror coatings come in a variety of colours such as silver, gold, and blue.
The entire optical part of Spherical contact lenses has the same lens power throughout to correct myopia (nearsightedness) or hyperopia (farsightedness).
Different meridians of the Toric soft contact lenses have different powers to correct myopia or hyperopia and deliver a clear, stable vision. Designed to meet the special vision correction needs that are caused by astigmatism, they offer a unique solution to every person. Toric lenses are designed to correct the warp in the cornea with a cylindrical shape.
Depending on the issue of concern, for near and far vision, Multifocal contact lenses (including bifocal contacts) contain different power zones to correct nearsightedness or farsightedness as well as presbyopia. Multifocal lenses are also known to correct astigmatism in some cases.
Soft lenses are made from a material called hydrogels, which are gel-like, water-containing plastics that allow oxygen to pass through to the cornea. It can conform to the front surface of the eye. This is because the material makes these lenses appear very thin and pliable. First introduced in the early 1970s, what made the hydrogel lenses popular was the fact that they were found to be immediately comfortable without much adjustment
Disposable Contact Lenses must be removed every night. This type of lens is prescribed with a type of frequent replacement schedule or a brand new pair of lenses is used every day and disposed of after a day's worth of wear. To decrease the risk of eye infections, they should be replaced frequently to prevent the build-up of lens deposits and contamination.
Extended Wear Lenses can be worn overnight, for a period ranging from one to six nights or up to 30 days. They are usually soft contact lenses that allow oxygen to pass through to the cornea. The period of continuous wear depends on an eye care professional's evaluation, so the tolerance for overnight wear differs from person to person.
Hydrogel lenses comprise a combination of polymer and water, making a soft material with limited oxygen. It can be worn in open eye condition for 8 to 10 hours, depending on the thickness and water content of the lens. If the lens is thinner, it proves to be more difficult to handle. If worn longer than recommended, there will be more protein deposits and redness around the cornea that causes much discomfort.
Silicone Hydrogel lenses are a combination of silicone, polymer and water, delivering a soft lens with sufficient oxygen. This composition contains 5-6 times more oxygen compared to hydrogel contact lenses. It stays healthier, with whiter eyes even if worn longer than recommended and offer more comfort because of the fewer protein deposits. Due to the low water content material, these lenses show the least dryness symptoms. Silicone hydrogel lenses can be worn for 24 hours and occasionally while sleeping, only with the recommendation of an eye care practitioner.
Picking the right eyeglasses sure isn’t a cake walk especially when you’re provided with a plethora of choices when it comes to frame, colour, etc. But, with the help of the right guide and assistance you can surely pick the perfect fit with absolute ease! Although the right fit can make your outfit pop, the wrong one can leave quite a mess. But worry not and follow our detailed guide on finding the right fit and knowing your eyeglasses.
Let us first dive into eyeglass frames in depth.
It is highly important to know your frame specifications before picking the right pair of eyeglasses. The most pivotal parts of any eyeglass frame includes the rim, end pieces and the bridge. These three parts contribute to the look and character of your glasses, holding them in place and giving them substance.
Measure horizontally across the entire front of the frame. Include any lug or hinge pieces that stick out on the sides.
Measure the lens vertically, at its tallest point. For bifocal or progressive prescriptions, the lens height must be at least 30 mm.
Measure horizontally, at the top of the bridge, from the edge of one lens to the other.
Measure from the hinge—where the arm connects in the front— to the spot where the arm begins to bend down around the ear. Then measure from the top of the bend to the bottom tip. Add the two sections together for the total temple arm length.
Measure the lens horizontally, at its widest point. Make sure the lens width accommodates your pupillary distance so that your eyes align with the “optical center” of the lens.
Taking note of the countless designs and styles out there, it’s important to choose a set of frames that will match and complement your look everyday. The solution to your eyewear troubles is your face shape!
It plays an important role to determine which frame would look the best on you. Your face shape is the best determinant of what frames will suit you best. Blend eyewear and a personal style statement with this buying guide for eyewear frames.
Refer to the chart below to see the recommended frames based on your face shape.