ALL (ALMOST) ABOUT LENSES AND FRAMES
- Frames materials details
- Lenses what for?
- Lenses index and thickness
- The prescription
- Understanding the prescription
- The pupillary distance (PD)
- How to measure your own PD at home
- Lens treatments and eye protection
- The look
- Full satisfaction guarantee
- Pure 100% Titanium
- Stainless steel
- Memory Titanium
- Acetate, hand made
- Monel alloy
- Clip-on, magnetic plus optical steel frame
- Titanium - This premium metal is very strong, durable, corrosion-resistant and 40% lighter than other metals. It’s also hypoallergenic making it a nearly perfect material for eyeglass frames.
- Aluminium - A very much appreciated metal for its light weight and strength. Provides elegant, corrosion resistant designer frames
- Stainless steel - This is an iron-carbon alloy that also contains chromium. Stainless steel frames are lightweight, strong, durable, flexible and corrosion-resistant.
- Monel - This popular material is an alloy of nickel and copper. Cheap albeit durable frames
- Acetate - This material is a lightweight most popular plastic also used for designer and branded eyeglass frames and sunglasses
- Monel alloy : very light and quite flexible low cost though long-life resistant materil
- Clip-on, magnetic polycarbonate sunshades wih optical steel frame. Excellent eye protection under the sunlight
LENSES: GLASSES WHAT FOR?
- Single Vision - These lens come with one fixed focus correction over the entire lens area either for near, intermediate, or distance vision. Driving or reading or computer work glasses are single vision.
- Distance, intermediate and near vision: Progressive lenses (also known as multifocal) - They have a no-line three fields of focal correction with the top portion for distance-vision, narrowing to the lower middle for mid-range vision, and finally to the bottom portion for the near-vision or reading. The frame total height for this type of lens must be 29mm, although we recommend a taller lens for more comfortable vision.
- Free Form lenses (latest progressive vision technology) - These ultimate technology lens are also know as "Individually Customized lenses." Whereas traditional lens are tailored for a broad categories of wearers, Free Form advanced technology enables customizing the lens design for individual prescriptions using computer ray tracing and lens-eye modeling state-of-the-art computer generated algorithms.
- Free Form lenses are not only made at the wearer's specific prescription but also to his frame measurements. This technology has the capacity to produce lenses with accuracy down to .05 diopters, a considerable improvement over current technology which is accurate to +/- 0.12 diopters. They are also known as “Distorsion Reducers” or “Rear Surface” lenses being them programmed on their back surface, nearer to the eye.
- Photochromic, or Transitional or Tint lenses - All the above lenses may be photochromic: they will progressively darken outside in sunlight almost as sunglasses. The shade of the lenses is slightly lighter than regular sunglasses and take a minute to transition to the darkened shade. Likewise, when moved out of the sun, the lenses take a minute or two to return to clear lenses. The total frame lens height must not be less than 29mm though we recommend a taller lens for more comfortable vision.
LENSES INDEX AND THICKNESS (suitable for the various focal corrections)
- Standard 1.499 Index CR-39 - SPH +/- 2.25 and below CYL +/- 1.50 and below. These traditional plastic lenses made from a hard resin are great for almost any prescription and much lighter and less breakable than glass lenses.
- 1.56 RX Index Custom Power: the most popular - SPH +/- 2.50 to + 4.00 CYL +/- 1.50 to +/- 2.00. Up to 20% thinner than Standard Plastic CR-39 lenses which provide the ultimate in thin size, optically superior lenses.
- 1.56 RX PC Polycarbonate - SPH +/- 2.50 to + 4.00 CYL +/- 1.50 to +/- 2.00. Much thinner and stronger than standard lenses, ideal for sports and children glasses.
- Super thin Hi-Index 1.61 Index - SPH +/- 4.25 to +/- 6.75 CYL +/- 2.25 to +/- 3.00. Up to 30% thinner than Standard CR-39 lenses.
- Ultra thin Hi-Index 1.67 index - SPH +/- 7.00 to +/- 9.00 CYL +/- 3.25 to +/- 4.0. Up to 42% thinner than Standard CR-39 lenses
- Ultra-super thin Hi-1.74 Index - SPH +/- 9.25 to above CYL +/- 4.25 to +/-6.00. Acetate - The thinnest lens available today
- Lens total height is very important when ordering bifocal or progressive lenses. The total lens height must be 29-30mm or greater although we recommend a taller size for more comfortable vision.
- If you've never worn prescriptions glasses to date: You cannot order them online: you should definitely go to your eye doctor or a certified optometrist for an accurate and complete prescription that will also include your PD. You'll have it at hand for years. It is more accurate when delivered by a doctor although you'll have to pay for it, but and it does not cost a fortune.
- If you already wear spectacles: As 95% of eyeglasses online buyers who turn online buyers after having been spoiled at optical shops, you could ask an optometrist to read your measures through your lenses. It's a very quick and free of charge measurement.
UNDERSTANDING YOUR PRESCRIPTION
- SPH - The spherical number is the correction power value for near or far sightedness. If PL or Plano is written here, it means Zero. Value is (-) minus for distance and (+) for near vision
- CYL - Cylinder indicates the correction for astigmatism. If the optometrist wrote "DS" or "Sph" or "Spherical" in the Cylinder space no correction is required, that is PLANO on the form. Cyl requires filling Axis angle value.
- AXIS - Axis refers to the angle of astigmatism from 1 to 180. The Axis value is usually written as 3 digits, which means if your Axis value is 5, it may be written as 005.
- ADD (Addition) - This is the correction power for bifocal and progressive intermediate and reading near-vision. This value is a must when ordering bifocals or progressives lenses.
PUPILLARY DISTANCE (P D)
- The PD or Pupillary Distance is the distance between the pupils of both eyes, center to center in millimeters (1 inch = 25.4mm). Unfortunately many optometrists leave this quite necessary measurement off of prescriptions but it can be measured at home (see below.)
- Most people have a PD measurement that falls within the 54mm to 74mm range. PD may be written as 32/34.5 which are the right eye and the left eye partial PDs from the center of the nose to either eye. In this case the total PD is the sum of the two, 32+34.5 = 66.5
- Measuring our own P D : Contrarily to what opticians may tell you it's quite easy to measure your pupillary distance in your own home.
- If you've never worn prescriptions glasses to date : You should definitely go to your eye doctor for an accurate and complete prescription that will also include your PD. You'll have it at hand for at least 2 years.
- If you already wear spectacles : As 95% of eyeglasses online buyers who turn online buyers after having been spoiled at optical shops here is what you need: • your existing eyeglasses (don't care much about the prescription providing you can see through the lens) • a non-permanent marker • the help of a third person.
- How to do it : Stand in front of the third person and look at the distance, not at the person. Ask him/her to mark on your lenses the points that correspond to your pupils. Then measure your total pupillary distance as well as the partial right and left PDs running from the center of your nose to the respective pupils. Redo the operation 3 times to ascertain that you have the correct measures.
LENS TREATMENTS AND EYE PROTECTION
- Anti-reflective (AR) included : This coating improves both the vision and the appearance of your eyeglasses. It is a layered metal oxide coating applied to both sides of the lens that greatly reduces both the internal and external reflections on the lens surface while allowing more light through the lens. Your eyes will be seen through the lenses in place of the light reflection. At night AR considerably reduces the annoying glare, reflections and halos around lights, making it much more comfortable and safer for driving.
- Anti-Scratch (HC : Hard Coating) included : Our clear front and rear anti-scratch treatment makes lens sensibly more scratch-proof, given that not even glass is scratch-proof.
- Ultra-violet Treatment ( Anti-UV) included : Our UV treatment blocks the sun's harmful rays from damaging your eyes without changing the appearance of the lenses. Over exposure to ultraviolet may cause cataracts, retinal damage and other eye problems.
- Tinting (Tint) optional (available only for clear glasses) : Our treatment provides a tint which remains constant at all times, not to be confused with the photochromic lens which change shade according to the amount of sunlight. Tints are available in brown, grey and green (grades: 20%, 40%, 60%, 80%). Lighter, fashion tints are used primarily for cosmetic purposes to enhance a wearer's looks. Darker tints allow the wearer to use the lenses as sunglasses.
- Clip-on Sunshades : These are a lightweight, functional, polarized and 80% density Gray, Brown and Green clip-on sunshade add-on items will turn any of your eyeglasses into as sunglasses.
- TEST THE FRAMES LOOK : Just use our “Try-On” application (in progress) to see how your selected frames look nice on model faces or on your own uploaded photo.
WHAT IF I'M NOT SATISFIED WITH THE QUALITY?
- In case you're not satisfied with the quality and make of our glasses you can resend them to us and get a full refund or a replacement. Please read our Terms and Conditions Agreement and our Guarantee.
What they say Cosa dicono On nous écrit
Anna, gli occhiali sono arrivati oggi perfettamente integri. Voglio ringraziarvi di cuore. Alberta C . Lavagna (GE) Italia
Hi Anna, My glasses arrived in good shape. Love the style and quality. I'm passing this good deal on to my friends and family!! Thanks again. Don V. San Diego. U:S.A
Gli occhiali sono perfetti. Grazie. Ottimo prodotto, ottimo prezzo e ottimo servizio, Valeria Moroni,Bologna , Italia
Bonjour, Finis les prix inabordables des lunettes de vue proposées dans les boutiques. Merci vistalowcost. Marcel Leroux, Avignon , France