Description
A progressive lens is not one lens. It is several prescriptions blended across a single surface, and the invisible part is the corridor, the channel that carries the reading zone down from the distance zone. Nobody sees it. Everybody notices when it is wrong, and the usual complaint is not blur but a floor that seems to tilt.
These lenses are cut from CR-39 resin with a corridor that can be specified at 9, 11, 13, or 15 millimetres, with 11 millimetres as the standard. Corridor length decides how much head movement the wearer accepts: a shorter corridor suits a shallow frame and a habitual reader, a longer one spreads the zones for a taller lens and a wearer who moves between near and far all day. On top of the optical design the lens carries several coatings at once: a hard coat, an anti-reflective layer, an HMC broadband coating, UV400 filtration, and a blue light filter for screen work. The photochromic layer does the rest, staying clear indoors and darkening outdoors as ultraviolet light rises.
There is one thing to understand before ordering. This is a lens blank service, not a finished pair of glasses. You supply your prescription and choose the index, diameter, and corridor, and the lenses arrive ready for a frame. Higher index means a thinner lens for a strong prescription, and CR-39 remains the sharpest of the common materials for the money. If the numbers are entered correctly, the pair that comes back from your optician is the pair you specified.
The frame gets the compliments. The lens gets the vision.
Key Features
- ✦ Progressive corridor available in 9, 11, 13, and 15 millimetres, with 11 millimetres standard.
- ✦ Photochromic layer stays clear indoors and darkens in outdoor ultraviolet light.
- ✦ UV400 filtration blocks the full ultraviolet range.
- ✦ Anti-blue light filter reduces screen glare for desk and phone work.
- ✦ HMC broadband coating with anti-reflective, hard coat, and EMI layers.
- ✦ CR-39 resin in 1.56, 1.61, and 1.67 index for a thinner lens at higher prescriptions.
- ✦ Supplied as lens pairs, ready for your own frame.
Technical Specifications
- Brand: BCLEAR
- Material: CR-39 resin
- Type: Progressive, photochromic, anti-blue light
- Sphere Range: +8.00 to -10.00
- Cylinder Range: 0.00 to -4.00
- Addition Range: +0.50 to +4.00
- Refractive Index: 1.56, 1.61, 1.67
- Diameter: 65 mm, 70 mm, 75 mm
- Corridor: 9 mm, 11 mm (standard), 13 mm, 15 mm
- Coatings: HMC, anti-reflective, hard coat, EMI
- UV Protection: UV400
- Photochromic Colour: Grey or brown in daylight, clear indoors
- Certification: CE
Where It Belongs
Wearers who move between near and far all day and want one pair instead of two; office workers who want blue light filtering and outdoor tinting without swapping glasses at the door; high prescriptions where a 1.61 or 1.67 index keeps the edge thickness down; and opticians or customers ordering lens pairs to fit a frame they already own.
Frequently Asked Questions
Q: Do I need to send my prescription?
Yes. Progressive lenses are cut to your sphere, cylinder, addition, and pupillary distance. Ordering without a current prescription will not produce a usable lens, so have your optician's numbers ready.
Q: What does the corridor length change?
The corridor is the channel between the distance and reading zones. A shorter corridor suits a shallower frame with less head movement, while a longer corridor spreads the zones across a taller lens. Most wearers are comfortable at 11 millimetres.
Q: How dark do the lenses go outside?
The photochromic layer darkens in response to ultraviolet light, reaching a grey or brown tint in direct sun and returning to clear indoors and in a car, where windscreen glass filters much of the ultraviolet.
Q: Which index should I choose?
Index relates to thickness, not prescription strength. A 1.56 lens suits lower powers, while 1.61 and 1.67 keep a strong prescription from looking thick at the edge. CR-39 at 1.56 remains the sharpest option for lower powers.
Q: Are the lenses compatible with any frame?
They arrive as uncut or semi finished pairs sized to your diameter choice, ready to be edged to your frame by an optician. Any standard frame can be fitted, provided the lens diameter covers the shape.
The EastSupplier Promise
EastSupplier lists the corridor options, the index range, and the coating stack because those are the three choices that decide whether a progressive lens works for the wearer. Have your prescription ready before ordering, and request confirmation of the numbers if anything is unclear. Correctly produced prescription lenses are made to order.
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