Opening

See the World Differently

Calculated before it is made.

CLIFF · Prescription lenses

Across your day

One prescription. Every kind of light.

A young man in black sunglasses with solid black lenses sits by a bright, glittering sea, a striped towel over his shoulder.

At the water

Dynamix single vision, polarized

A woman in her forties in rose-gold glasses holds a small bunch of flowers at a bright street market and looks across the street.

At the market

Zenn progressive

A man in his late fifties with a short gray beard and thin gunmetal glasses sits at a studio desk with drawings and an architectural model, looking out of the window at the city.

In the studio

Zenn AI

A woman in her sixties with gray hair and light gold glasses reads a small seed packet in her garden on a bright morning.

In the garden

Versatile

The range

Four designs,
one ladder

Not how old you are, or how strong your prescription is. What your eyes actually do all day.

Compare the full range
A woman in her sixties with gray shoulder-length hair and light gold glasses sits back at a kitchen table in the daylight, looking up from a newspaper into the room.
  1. 01

    Versatile

    Ready-made 1.56 progressive, held in stock — clear BLUESAFE or photochromic DRIVE CLEAR, available immediately

  2. 02

    Dynamix

    Freeform, surfaced to your exact prescription and calculated for your frame

  3. 03

    Zenn

    Compensated point by point, center to edge

  4. 04

    Zenn AI

    AI-chosen design, progressive or single vision

The right lens is a question about your day.

Tell us what your eyes do all day — close work, screens, the road — and we will point you to the design built for it.

What fills your day?

Find your lens

The process

Calculated before it is made.

See how a lens is made
  1. A clear liquid filling a steel-ringed optical mold.
    01

    Liquid monomer · optical mold

    Cast

    Liquid monomer is precisely filled into an optical mold.

  2. A thick, clear lens blank resting on a warm-lit surface.
    02

    Front finished · back left thick

    Blank

    The material is polymerized into a thick, clear lens blank.

  3. A clear lens blank held on a bolted steel fixture, a fine point descending to touch the center of its surface.
    03

    One surface map · one order

    Calculate

    Your prescription and design are mapped onto the back surface.

  4. A diamond point cutting the back of a clear lens blank, fine droplets thrown from the turning surface.
    04

    Back surface · every made-to-order lens

    Surface

    A diamond tool cuts the prescription and freeform design into the back surface.

  5. Lenses held in the dome of a vacuum coating chamber.
    05

    UV protection to 400 nm · 12-month coating warranty

    Coating

    Anti-reflective layers are laid down in a vacuum chamber, over the hard coat.

  6. A thin finished lens standing on its edge on a dark surface, its slim polished rim catching the light, the CLIFF mark etched faintly on the glass.
    06

    Fitted by your optician

    Finish

    A finished lens — clear, precise, made for one prescription.

Authenticity

Verify your lens any time

Enter the serial number printed on your CLIFF certificate to confirm the lens it was issued for.

Printed on your certificate, like CLF-4021-8830.

Journal

Read the technical detail.

  1. One pair of glasses on a desk at dusk, a window and laptop soft behind, an old pair of reading glasses set aside in its case.
    Learn

    What are progressive lenses, and are you ready for one?

    Every distance in one lens, with no line. What progressives solve, who they suit, and what the first two weeks actually feel like.

    Read
  2. A pair of glasses resting on the top step of a dim staircase, the steps below seen through one lens.
    Learn

    Getting used to progressives: the first two weeks

    A practical, reassuring guide to progressive lens adaptation — what is normal, what helps, and the signs that mean you should go back to your optician.

    Read
  3. A laptop's faint screen glow outshone by a slab of sunlight across the desk, a pair of glasses lying in the sun.
    Learn

    Do you actually need blue-light protection?

    An even-handed look at blue-light glasses: what the evidence supports, what it does not, and when the feature is genuinely worth paying for.

    Read
  4. Three pairs of glasses on a table at the edge of sunlight: clear, gray-lensed, and dark sunglasses.
    Learn

    Photochromic, polarized, or sunglasses?

    Photochromic, polarized, or plain prescription sunglasses — what each does well, where each fails, and which suits your day. A plain decision guide.

    Read
  5. A pair of glasses on the edge of a stone basin under a gentle stream of water, a folded microfiber cloth beside them.
    Learn

    How to clean your lenses without ruining the coating

    Most scratched lenses are dry-wiped, not unlucky. The right cleaning method, the things that quietly wreck a coating, and the habits that add years.

    Read
  6. A finished lens in a stand, a fine map of points of light across its surface, closer together toward the edge.
    Learn

    Why lenses cost what they cost

    Two lenses with the same prescription can cost very differently. The freeform-versus-standard story behind the whole ladder.

    Read
  7. An open book on a dark desk in lamplight, its nearest page soft and out of focus, reading glasses at the far edge.
    The Science

    Why near vision changes with age

    The decline of accommodation is the most predictable change in human vision. Here is the actual curve — and why it isn't a disease.

    Read
  8. A pair of glasses on an old sun-bleached window sill, in a hard slanting beam of sunlight.
    The Science

    Ultraviolet and the eye

    UV damage to the eye is cumulative, invisible, and largely preventable. What the research actually shows — and what UV400 protection means.

    Read
  9. A glass prism casting a spectrum across a dark bench, its blue end falling across one lens of a pair of glasses.
    The Science

    Blue Light: What the Research Does and Doesn't Show

    The most over-marketed topic in eyewear, graded claim by claim — including what our own lenses can and cannot promise.

    Read
  10. A clear progressive lens standing on its edge in warm light: a distant horizon seen through its top, an open book through its bottom, the sides of the view softly blurred.
    Learn

    Getting used to your new progressives

    A stage-by-stage guide to adapting to new progressive lenses: the first three days, the first two weeks, and when to see your optician.

    Read
  11. Five thin clear lenses of the same size stood on their edges in a row on a dark surface, each turned so both its face and its slim polished edge show, each edge a little slimmer than the one before, warm light running along every one.
    Learn

    Choosing your lens index

    What each lens index is for — 1.50, 1.56, 1.60, 1.67 and 1.74 — and why the lowest index that looks right is usually the correct choice.

    Read
  12. Two lenses in beams of warm light: one gathers its beam to a bright point, the other spreads its beam outward.
    Optical glossary

    Sphere (SPH)

    The main power of your prescription, in diopters. Minus corrects nearsightedness, plus corrects farsightedness; further from zero means stronger.

    Read
  13. A cylindrical lens focusing a beam of light into a thin bright line instead of a point.
    Optical glossary

    Cylinder (CYL)

    The correction for astigmatism, where the eye's optics focus light along two different lines instead of one point. Always paired with an axis.

    Read
  14. An optician's trial frame with two round lenses on a dark desk, light passing through them in two bright rings.
    Optical glossary

    Axis

    The orientation of your astigmatism correction, from 1 to 180 degrees. A cylinder value without an axis is meaningless.

    Read
  15. A progressive lens in front of ruled paper, the lines appearing larger through its lower part.
    Optical glossary

    Addition (ADD)

    The extra reading power added to the lower part of a progressive or bifocal. Typically starts near +1.00 in the early forties and usually settles near +2.50 (up to +3.00 for close working distances).

    Read
  16. A frame on a leather fitting mat, a fine thread stretched between dots at the center of each lens.
    Optical glossary

    Pupillary distance (PD)

    The distance between your pupil centers in millimeters. It positions each lens's optical center in front of each eye; errors cause strain even with a correct prescription.

    Read
  17. A lens in a small stand bending a narrow beam of warm light to one bright focal point.
    Optical glossary

    Diopter

    The unit of lens power. One diopter focuses parallel light at one meter.

    Read

Behind the counter

Help, before and after the fitting.

Write to the CLIFF desk

info@clifflens.com