By LensPT Team · Published October 28, 2026
HC, HMC and SHMC are coating labels, not complete lens specifications. HC commonly identifies a hard coat; HMC commonly identifies a hard coat with an anti-reflective multilayer treatment; SHMC commonly identifies a multi-coated package with a super-hydrophobic surface. Suppliers can use the abbreviations differently, so a quotation should describe the actual package as well as its name.
For optical distributors and eyewear brands comparing HC vs HMC vs SHMC lens coatings, the useful question is what the delivered lens must do, how that requirement will be checked, and which configuration the evidence covers. Begin with the required lens material and design, then separate abrasion resistance, reflection control and cleanability.
Publisher disclosure: LensPT supplies optical lenses and publishes this guide. The explanations draw on public manufacturer information and LensPT product listings; the comparison record is an editorial purchasing tool. No physical coating tests were performed. The cover is an AI-generated concept illustration, not a LensPT product photograph or test result.
What do HC, HMC and SHMC mean?
The terms provide a starting vocabulary. In its lens coating guide, OSS describes HC as a protective hard coating and HMC as a combination of hard coating and anti-reflection treatment. LensPT’s blue cut lens guide uses SHMC for a super-hydrophobic multi-coating in the range it discusses.
Keep those functions separate when comparing suppliers. A coating abbreviation does not specify a test method, acceptance limit, residual reflection color or the treatment applied to each lens surface.
| Trade label | Common meaning | Question to resolve on the quote |
|---|---|---|
| HC | Hard coating, used to improve abrasion resistance. | Which hard coat is supplied on the selected substrate, and what evidence supports the abrasion-resistance claim? |
| HMC | Hard multi-coating, commonly combining a hard coat and anti-reflective layers. | What reflection-control specification and surface finish are included? |
| SHMC | Commonly a super-hydrophobic multi-coated package. | What top-surface properties are offered, and how are water repellency, cleaning and durability evaluated? |
| UC | Uncoated, included here as a supply option rather than a coating. | What surface condition is delivered, and what processing remains? |
This is a terminology comparison, not a universal grading scale. Ask the supplier to expand the abbreviation in writing and identify its current coating specification. If its terminology differs, compare the described functions rather than forcing the product into a label.
Separate the three functions before choosing a package
Hard coating: abrasion resistance
A hard coat is intended to make a lens surface more resistant to abrasion. “Hard coated” does not mean scratch-proof. For purchasing approval, request the method, sample configuration and result behind the claim, then agree on the criterion relevant to the order.
Record the substrate and any subsequent processing with the coating. A result for a different material or finish should not silently become the acceptance evidence for the quoted lens.
Anti-reflective layers: surface reflection control
Anti-reflective treatment addresses light reflected from the lens surfaces. It can be combined with a hard coat and other surface treatments. ZEISS’s explanation of spectacle lens coatings describes these different layers and notes that residual reflections remain even with anti-reflective treatment.
Ask whether the quotation covers both surfaces and what reflection specification applies. If a numerical result is supplied, retain its measurement definition, conditions and report reference. “Green coating” alone leaves those questions unanswered.
Top-surface treatment: water repellency and cleaning
Hydrophobic refers to water-repellent behavior; oleophobic refers to oil-repellent behavior. A coating package may address both, but an abbreviation or a water-droplet photograph does not document every surface property. The ZEISS explanation describes an easy-clean layer alongside the other treatments; its branded construction is not a LensPT specification.
For an easy-clean claim, ask what is being evaluated, which cleaning or conditioning procedure is used, and whether the reported result describes a new sample or a sample after that procedure. The buyer and supplier should agree on the evaluation before comparing results.
Compare HMC and SHMC with a coating record
Use one column for each quoted configuration. Keep the lens design and substrate consistent where the purpose is to compare coating packages. If either changes, identify that difference beside the results.
| Record field | What the buyer should retain |
|---|---|
| Product and coating identity | Supplier product code, coating code, specification revision, sample ID and quoted abbreviation. |
| Lens configuration | Material, nominal refractive index, optical design, power or blank reference, diameter and delivered processing stage. |
| Treatment scope | Hard coat, anti-reflective treatment, top-surface properties and the surfaces covered by each. |
| Appearance | Residual reflection color and transmitted appearance, with a reference sample and agreed viewing conditions. |
| Performance evidence | Requested property, method, sample condition, result, report ID and agreed acceptance criterion. |
| Processing and handling | Supplier instructions for any intended tinting, edging, mounting or further treatment, plus care instructions. |
| Commercial scope | Quantity, packaging, sample terms, destination and quoted inclusions or exclusions. |
| Approval | Reviewer, decision, date, unresolved fields and the specification approved for repeat supply. |
The record supplies fields, not invented pass limits. If a requirement is not yet defined, write “supplier to propose for buyer review” and name the owner of the decision.
For example, two quotes may both say HMC while only one describes a hydrophobic finish. Hold the cleanability comparison until the second supplier identifies what is included. This hypothetical example illustrates a missing specification; it is not evidence that either supplier’s product is better.
Do reflection color and blue cut identify the coating?
Residual reflection color is an appearance characteristic. Keep it in the sample-approval record, but do not use it alone to rank anti-reflective performance or durability. Compare samples under the same agreed lighting and viewing conditions, alongside the relevant documentation.
Blue cut and anti-reflective treatment also describe different functions. A blue cut lens can include an HMC or SHMC package, but the package label does not define the full filtering profile. Use the blue cut lens guide for filtering-route and spectral-data questions. Keep any UV or blue-light claim tied to its own product-specific evidence.
Which coating options does LensPT list?
LensPT’s current product pages list different finish options for different routes. The examples below identify where to begin an inquiry; they do not establish that every material, index and coating combination is available.
| Product route | Published finish or coating options | What to confirm |
|---|---|---|
| Clear single vision lenses | UC, HC, HMC and custom coatings. | The coating code and available package for the chosen material and index. |
| Blue cut single vision lenses | Blue cut with HMC, SHMC or custom coatings. | Filtering configuration, coating color and complete surface-treatment scope. |
| PC photo gray lenses | HC, HMC and custom coatings. | The offered finish for the requested photochromic configuration. |
These listings were checked on October 28, 2026. They provide coating names and order inputs, not numerical abrasion, reflection or cleanability results. Request the current specification and available evidence for the exact item. SHMC is explicitly listed on the blue cut single-vision route; do not carry that option across to another product without confirmation.
Approve the specification before repeating the order
Connect the sample decision to a product code and coating revision. Record whether the sample is approved, needs revision or remains on hold pending missing information. A price approval and a coating approval should remain distinguishable in the purchasing record.
For repeat supply, identify the fields that require notification and review if changed: substrate, coating code, surface coverage, residual color reference or agreed evaluation method. Ask the supplier to list proposed substitutions on the quotation. This is a suggested buyer record, not a claim about LensPT’s internal factory procedure.
Also state the delivery stage. If your team will perform further processing, clarify that scope with the supplier. Our finished vs. semi-finished lens guide explains why the coating request and processing responsibilities belong on the same inquiry.
Coating questions buyers often ask
Is SHMC always better than HMC?
The labels alone cannot establish a winner. Compare the actual packages against the required functions and agreed evidence. An additional top-surface feature does not, by itself, establish a numerical advantage in every coating property.
Does HC mean the lens has an anti-reflective coating?
HC commonly identifies hard coating. If reflection control is required, ask for the anti-reflective treatment to be stated separately on the quotation.
Can coating color replace a specification sheet?
No. Color helps describe appearance. The product code, coating scope, test evidence and approved sample define the purchasing requirement more fully.
Request a coating-specific quotation from LensPT
Send the lens design, material or nominal index, diameter, requested finish, residual color reference, quantity, packaging and destination market. Add the properties you want documented, your intended further processing and any unresolved sample-approval questions.
Discuss your lens coating specification with LensPT. Ask the sales team to confirm the available combination and identify the coating package in the quotation so the sample and order refer to the same configuration.