Type of Lenses
When choosing lense for your glasses, you will find many options of materials, designs and treatments. Here we will explain what you should take into account to choose appropriate lenses for your glasses and how to use them...
» HOW TO SELECT YOUR LENSES FOR YOUR EYEGLASSES?
When choosing lense for your glasses, you will find many options of materials, designs and treatments. Here we will explain what you should take into account to choose appropriate lenses for your glasses and how to use them. First of all make sure you know what your lenses are for. Do you need them for reading?, or for distance?, or for both?. This information is also found in your eyeglasses prescription. If you do not understand your prescription, here here we explain how to interpret your prescription.
» What do you need your glasses for?«
Depending on the use you are going to give your glasses, you will find two options:
» Monofocal Lens (single vision eyeglasses):
Used to correct myopia, hyperopia, and astigmatism if you are young. This type of lenses is also used to correct near vision in presbyopia . These eyeglasses have only one prescription in the lenses with the same focal power from top to bottom. Multifocal Lenses
» Multifocal Lenses
Multifocal lenses have two or more lens powers allowing you to see at two or distances. There are two groups of multifocal lenses: Bifocals and Progressive lenses.
» Bifocal Lenses:
Bifocals are two lenses in one. These lenses allow you to see at two distances, usually far and near. One part, or segment (usually the bottom), is made to adjust the eye for close focus, and the other (top) has a different strength for distant focus. We offer two types of bifocals: Flat Top and Invisible Bifocals.
|Flat Top Bifocal:||Invisible Bifocals:|
|In Flat top bifocals, the lens segment designed to correct near vision comes with a half moon shape . The separation between the distance and near segment of the lens is visible.||Invisible bifocals come without a visible line dividing the segments. "Blended" or "seamless" bifocals have the segment line polished so that it is not visible as a distinct line. In the area of blending, some blurry vision results, which can make this type of bifocal more difficult to get used to than standard types|
» Progressive Lenses:
Progressive lenses are multifocal lenses that allow multiple vision fields in one lens. They provide a seamless progression of many lens powers that increase gradually from top to bottom. These lenses are designed to correct all distances from far to close,
» The quality of your lenses «
Once you know what your eyeglasses are for, it is time to choose the quality of your lenses. The lens quality depends on the material of the lens, the thickness of the lens and treatments and filters that are added to the lenses.
» Lens Material
The lens material selection will depend basically on your level of activity, prescription and comfort. There is a range of lens materials available. The most known materials are:
It is an organic material known as a low-cost, low-index (1.5) conventional plastic and is mainly used to make low-power lenses where thickness and weight are not important factors. It is a very stable material with excellent optics and is easily colored. Disadvantages: thick, does not meet expectations aesthetically and tends to turn yellow over time.
Glasses with polycarbonate lenses are thinner and lighter than traditional plastic lenses due to their high refractive index. They are up to 10 times more resistant to impacts than plastic lenses, thaty why they are recommended for sports and industrial use. Thermally resistant, light and aesthetically excellent. Disadvantages: the material is a little complex to process, increasing the cost. It can not be colored, or only allows a very soft coloration, to have low chemical resistance. Because of the need to create thinner and lighter lenses, lens manufacturers have introduced high-index lenses. Its thickness and weight depend on the index of refraction of the lens. (Read more about refractive index)
Mid-Index from 1.56 to 1.59:
Thinner than conventional plastic lenses. Recommended for prescriptions with sphere correction between +/-5.00 and +/-4.00, and cylinder corrections of +/-3.00 and below. Polycarbonate lenses are included here.
High index 1.61:
These lenses are thinner than mid-index lenses. Recommended for sphere correction between +/-4.25 and +/-6.75, and CYL corrections between +/-2.25 and +/-3.00.
High index 1.67:
These lenses are super-thin. Recommended for sphere correction between +/-6.75 and +/-9.00, and CYL corrections between +/-2.25 and +/-4.00.
High index 1.74:
These lenses are ultra-thin. They are the thinnest lenses we offer. Recommended sphere corrections over +/-9.25 and cylinder corrections between +/-4.25 and +/-6.00
» Lens filters and treatments «
Lenses can be treated directly in their matrix, or by treatments applied to the surface of the lens. The purpose of filters and treatments is to protect the eyes from light or to extend the duration of the lens. The most common treatments are:
extend the duration of the lens. The most common treatments are: Scratch Resistant
There are no lenses that are completely scratch-proof, however, anti-scratch layer protection is applied to the surface of the lens to make the surface more resistant.Anti-reflective Coating (AR)
Antireflective coating is a type of optical coating applied to the surface of lenses to reduce reflection. Besides its great look, it also improves vision and reduces eye strain. Ideal for computer use and night driving.
Consiste en un químico que se aplica a la matriz del lente bajo altas temperaturas. Impide el paso de rayos.
Ultraviolet (UV) coating
UV coating is a clear, protective coating applied to the lens to procide 100% UV protection.
Blue Light Filters
Blue light filters provide all-day-protection against the harmful effect of high-energy light emitted by digital devices such as cell phones, tablets and laptops. Recommended for all people who are in front of screens more than 3 horas/day. The blue light emitted by these screens is harmful to the eyes and can trigger chronic diseases that affect the retina. (read more)
» Choose the type of lenses «
Now that you know the use and quality of lenses that best suit you, the next step is to determine the tyle of lens you need or prefer.
» Clear Lenses (No Color):
Select this option if you don´t want any color on your lenses.
» Photochromic Lenses - Light Adjusting Lenses:
These are lenses that change from light to dark depending on lighting conditions. Photochromic lenses are lenses that react to changes in illumination, more precisely, to the presence of ultraviolet (UV) light. These lenses are clear indoors and darken when exposed to light, in proportion to the amount of ultraviolet radiation. As the UV light diminishes, the lenses will lighten. The most popular photochromic lenses on the market are Transitions lenses.
Include tinted, mirrored and polarized lenses
» Lens Tint Colors
Glasses with colored lenses can be used to improve the appearance, but also or the comfort of your glasses, or... just for fun. Tinted lenses are not only used for fashion, they actually serve different purposes, such as reducing glare, improving contrast, enhancing your depth perception, and comfort. Each color has unique features. Keep in mind that tinted lenses without UV treatment does not provide sun protection. It is necessary to add UV treatment to make them 100% UV blockers. Color features:
Yellow or Orange Lenses:
It absorbs little visible light and it is believed that by blocking the blue light, they improve contrast and sharpness especially at night or on cloudy days. Ideal for skiers, riders and hunters.
They do not alter the contrast or colors. They are considered neutral lenses, ideal for driving.
They distort the natural colors a bit and increase the contrast. They offer a sense of well-being.
They increase the contrast, ideal for low lighting conditions.
Blue or Purple Lenses:
Reduce glare, improves color perception. Recommended for golf
» Polarized LensesPolarized lenses filter light that reflects horizontally on surfaces such as snow, water, pavement, and allows vertical light to pass which reduces glare. They are very useful for driving, sailing, fishing, and skiing.