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Process and coatings

Eight steps from mould to warehouse

Seesee casts its own substrates and coats them in the same plant. The About page photographs the line in eight numbered steps; the product pages add the coating grades and the tests. This page puts them in order.

  1. Workers in white coats fitting glass moulds with coloured gaskets on a bench at the Seesee plant
    01Mold fitting
  2. A gloved hand holding a filled mould assembly over a steel tray
    02Injection
  3. Rows of cast lenses hanging in racks along a cleaning line
    03Cleaning preparation
  4. An enclosed hard-coating line in a white room, lenses moving through glass cabinets
    04Cleaning and hard coating
  5. A loaded coating dome holding dozens of lenses before vacuum coating
    05Multi coating
  6. An inspector holding a lens up to a lamp for visual inspection
    06QC inspection
  7. A packing machine with a monitor and a row of lens envelopes
    07Packing
  8. A long aisle of shelving stacked with labelled lens boxes
    08Warehouse

Photographs and step names from the About page. The single vision landing page describes the steps in one sentence each, for example: "Lenses are cleaned again and then coated with a hard layer to enhance durability and scratch resistance."

Equipment

Twenty Korean coaters, twelve Satisloh machines

EquipmentCountSource
Korean multi-coating machines20About page, catalogue, YouTube description
German Satisloh multi-coating machines6About page, catalogue
Satisloh Freeform machines6About page, catalogue
Production lines6home page
Daily output280,000 lenseshome page (pieces in the counter, pairs in the text)
Instrumentsover 30 advanced equipment and instrumentshome page counter

The home page sums the German units as "12 German Satisloh multi-coating and Freeform machines". Older third-party copies of the profile give smaller counts; only the factory's current figures are shown here.

A row of Satisloh VFT-orbit 2-E freeform generators in a white clean room at the Seesee plant
Satisloh VFT-orbit 2-E generators, 2025 catalogue.
A technician at an enclosed production line with signal towers in a white clean room
Production line, About page.

Coating grades

UC to SHMC, then Karat

Five grades appear on every table, and a set of named specialised coatings on top. The Karat page draws the stack as four layers: surface coating, multiple film layer, hard coat, uncoated substrate.

Seesee diagram of the Karat coating stack: a surface coating over multiple film layers, a hard coat and the lens substrate
Karat coating composition, product page diagram.
GradeMeaning as publishedWhere it is offered
UCUncoatedAll families
HCHard coatingAll families
HCTListed as a grade; expansion not publishedPC, sunlens
HMCHard multi coatingAll families
SHMCSuper hydrophobic multi coatingAll families
KaratAnti-scratch top coat over the multi layer, HC and UCBlue cut clear base 1.56 to 1.74; spin photochromic
Spin photochromicPhotochromic film applied by spin coating; normal, in-car, Karat1.56, 1.61, 1.67, 1.74, 1.57
Mirror, REVOMirror finishesSunlens, polarized 1.499
EMIListed on the freeform pageFreeform RX, sunlens
Anti-infrared, low reflectiveListed on the home page; the 2025 catalogue lists both in 1.56, 1.61 and 1.67Function lenses
Anti-fog, anti-glare drivingListed on the home pageAnti-glare driving in 1.56, 1.60 and 1.67 ASP; no index published for anti-fog

Tests the factory publishes

Wipes, sand, steel balls, nanometres

Each test below is stated on a Seesee product page or shown in one of its videos. Results are quoted as printed; none is independently verified here.

Published testLensResult as published
Ink wipingAnti-scratch Karat coating20,000 cycles
Sand-table shaking frictionAnti-scratch Karat coating300 cycles; scratch resistance 50% or more higher
Steel ball dropTrivex 1.558 / 1.6190 g ball from 1.27 m, lens not broken; 5.6 times the national standard
Impact testPC 1.591Video; guarantee 5 years
Transmission by band, GB/T 38120-2019Normal blue cut 1.56, 1.60, 1.67See the blue cut data sheet
Flashlight and instrument testBlue cutVideo; "Blocks harmful blue light and absorbs beneficial blue light"
Darkening timeFast change photochromicClear to dark in 5 seconds
Poster frame of the Seesee Optical video Trivex Eyeglass Lenses Impact Resistance Test, 22 seconds
Poster frame of the Seesee Optical video Polycarbonate Eyeglass Lenses Performance Test
Poster frame of the Seesee Optical video Anti scratch 2, Karat coating test, 36 seconds
Poster frame of the Seesee Optical video Blue Cut Lens Test Video, 35 seconds

Freeform RX lab

Six technologies named

  • Shamir and IOT design
  • Digital surfacing technology
  • Digital Ray-Path technology
  • CAD
  • CNC machining
  • Automated quality control

Source: RX freeform landing page

Multifocal quality control

Five checks

  1. Materials checked on arrival
  2. Automated processes on the lines
  3. Optical and surface inspection
  4. Coating checks: "Verification ensures uniform and effective coatings, including anti-reflective, blue cut, and photochromic."
  5. Final examination in the frame

Source: multifocal landing page

A finished lens half out of its white protective envelope, held in a white glove
Packed lens, normal blue cut product page.

Inspection welcome

"We support factory inspections."

The home page says so in those words. The plant is in the Optical Industry Park, Situ Town, Danyang, in the cluster that makes most of China's resin lenses.

Arrange a visit or a sampleCompany and certificates