Quick facts
- A rewetting drop is not the same product as a multipurpose solution. In the United States the two sit in one generic entry, but the entry names lubricating/rewetting as a separate function from cleaning, rinsing, disinfecting and storing.
- United States: soft lens care products are covered by 21 CFR 886.5928 in Class II (Special Controls), with a named 510(k) guidance document for the category.
- Canada: there is no Canadian entry naming a rewetting drop, so the class is derived by rule. Care products that contact the surface of the eye fall to Class II under Schedule 1 of the Medical Devices Regulations.
- The buying decision is a labelling decision. A product may be used in the eye only for the function its label names, which is why a clinic that substitutes a multipurpose solution for a rewetting drop is using it outside its intended purpose.
- Preservatives drive the clinical choice. Preserved multi-dose bottles suit some patients, unpreserved single-use vials suit others, and the lens material decides which is workable.
- Prescription release is a United States rule. The federal contact lens rule applies to United States prescribers; in Canada the equivalent duty sits with provincial college standards.
A rewetting drop is the smallest purchase in an eye care lane and the one most often bought by habit. It is also a regulated device in both countries, and the two countries regulate it by different mechanisms. This article covers what the product does, how each country classifies it, what the label has to say, what the label compatibility question actually tests, and how a clinic should set its stock levels.
What is a rewetting drop, and how does it differ from a multipurpose solution?
A rewetting drop is an in-eye lubricant. It is instilled while a lens is being worn to relieve dryness and to restore a comfortable wetting film on the lens surface. A multipurpose solution, by contrast, is a care system: it cleans, rinses, disinfects and stores the lens when the lens is out of the eye.
The distinction matters because the two products carry different claims and are handled differently in a practice:
- Function. A rewetting drop is used in the eye during wear; a multipurpose solution is used on the lens in a case.
- Contact time. A drop sits in the eye for a short period; a disinfecting solution has to hold the lens for the contact time its label states.
- Preservative load. Multi-dose bottles depend on a preservative system; single-use vials do not, which is why a vial is the format some patients are given.
- Lens compatibility. Silicone hydrogel and conventional hydrogel materials behave differently against the same wetting agent, and the manufacturer's compatibility list is what settles it.
A patient who uses a multipurpose solution as a drop, or a drop as a storage solution, is using a device outside its labelled function. That is the first reason the label, rather than the ingredient list, is the purchase criterion.
Which country entry names a rewetting drop?
Both countries regulate the product, and the mechanism differs in a way a buyer can act on.
| Item | Canada | United States |
|---|---|---|
| Named entry for a rewetting drop | None; class derived by rule | 21 CFR 886.5928, soft lens care products |
| Named entry for an RGP conditioning or wetting product | None; class derived by rule | 21 CFR 886.5918, rigid gas permeable lens care products |
| Named functions in the entry | Not enumerated by product name | cleaning, rinsing, disinfecting, lubricating/rewetting, storing |
| Class | Derived; eye-contact devices fall to Class II | Class II (Special Controls) |
| Premarket position | Device licence where the derived class requires it | 510(k) against the category guidance |
| Distributor obligation | Establishment licence held by the party placing it on the market | Establishment registration and device listing |
The United States entry is unusually explicit. 21 CFR 886.5928 describes the device as one "intended for use in the cleaning, rinsing, disinfecting, lubricating/rewetting, or storing of a soft (hydrophilic) contact lens", and it adds that the category includes "all solutions and tablets used together with soft (hydrophilic) contact lenses and heat disinfecting units". The parallel entry for rigid gas permeable products, 21 CFR 886.5918, repeats the list with one addition, "conditioning", in place of cleaning.
That is why the entry is the most useful single document in this purchase. It tells a buyer that one generic category covers five different jobs. The lens itself is classified separately: 21 CFR 886.5925 puts a soft lens in Class II for daily wear and Class III for extended wear, and 21 CFR 886.5916 draws the same line for a rigid gas permeable lens.
Does Canada classify a rewetting drop the same way?
Canada does not maintain a named entry for the product, so the class follows from the rules in Schedule 1 of the Medical Devices Regulations, SOR/98-282. The operative rule for anything that touches the eye states that all invasive devices that come into contact with the surface of the eye are classified as Class II. A Class II device needs a device licence, and the licence is held by the party that manufactures, imports or distributes the device rather than by the clinic that buys it.
Two consequences follow for a Canadian buyer:
- The clinic does not hold the licence. The clinic buys a licensed product; the licence obligation sits upstream. What a clinic can ask for is the licence number behind the product.
- The establishment licence is separate. A Canadian establishment licence is held by the party placing devices on the market. It is not the same instrument as a device licence, and the two are not interchangeable evidence.
Ontario practices also work inside the standards of their own college. The College of Optometrists of Ontario publishes standards of practice that cover contact lens fitting and follow-up, and the national association publishes a public eye health library that is useful for patient-facing handouts.
What does the label have to say, and why does compatibility testing matter?
The label is the document that keeps a clinic inside the device's intended purpose, and it carries four items a buyer should be able to find without searching.
- The named function. A drop labelled for rewetting is not labelled for disinfection, and a solution labelled for disinfection is not a drop.
- The preservative system and the format. Multi-dose versus single-use is a labelling fact, not a preference, and it decides which patients the product is suitable for.
- The lens materials covered. The compatibility statement names the lens materials the product was tested against.
- The discard rule. A multi-dose bottle has a period after opening; a single-use vial has a one-use rule.
| Format | What it suits | What the label settles |
|---|---|---|
| Preserved multi-dose bottle | Repeated in-eye use through a working day | The preservative system and the period after opening |
| Unpreserved single-use vial | A patient with a known sensitivity to preservatives | The one-use rule and the absence of a preservative |
| Case care solution | Storage and disinfection while the lens is out | The contact time the label states |
Compatibility testing is the part of the file that a clinic can ask about directly. Wetting agents, preservatives and lens polymers interact, and a compatibility claim is only as wide as the testing behind it. AOA guidance on contact lens care describes the care routine in patient terms and is a fair way to explain the same points at the chair. Where a practice dispenses to a patient who has previously reacted to a preserved system, the unpreserved single-use format is usually the first option to consider, and the fitting record is where that decision is written down.
Is prescription release handled the same way in both countries?
No, and this is one of the clearest structural differences in eye care retail.
In the United States, the federal Contact Lens Rule sets a national duty on prescribers to give patients a copy of their contact lens prescription at the end of a fitting, and it places conditions on sellers before they may supply lenses. There is no Canadian instrument in the same form. In Canada the equivalent expectation sits with provincial college standards, which is why a Canadian practice should read its own college's standard rather than a United States federal rule when it writes its release procedure.
For a buyer, the practical effect is narrow but real: United States documentation workflows are shaped by a federal rule, while Canadian workflows are shaped by a provincial standard. A supplier that serves both markets has to support both.
Which consumables does a lens care lane go through?
The lane consumes more than drops, and the surrounding consumables are what keep the routine hygienic.
- Hand hygiene and gloves. Examination gloves for handling lenses and cases during a fitting.
- Swabs and lint-free wipes. For cleaning trial lens cases and instrument surfaces rather than for the eye itself.
- Trial lens cases and labelling. Trial sets have to be tracked, and the tracking is a record.
- Dispensing paperwork. The prescription and the fitting notes are the two documents a review will ask for.
Where a lane also offers warm compress therapy, the USB heated eye mask belongs on the same consumables order as the drops and the swabs, because both are patient-contact eye care items held at the chair.
For practices buying at case level, the wholesale ordering page sets out account and case pricing, and the B2B wholesale collection lists the lines held for institutional buyers. Lanes that also run an in-house sterilizer for reusable instruments can start with the biological indicator 5-pack trial and read the sterilization monitoring collection for the monitoring lines.
Sources
- 21 CFR 886.5928, soft (hydrophilic) contact lens care products
- 21 CFR 886.5918, rigid gas permeable contact lens care products
- 21 CFR 886.5925, soft (hydrophilic) contact lens
- 21 CFR 886.5916, rigid gas permeable contact lens
- Medical Devices Regulations, SOR/98-282, full text
- Health Canada, medical devices
- College of Optometrists of Ontario
- Opto, Canadian Association of Optometrists eye health library
- American Optometric Association, contact lens care
- Federal Trade Commission, Contact Lens Rule
- CCOHS, emergency showers and eyewash facilities
- openFDA device classification database
- World Health Organization, laboratory biosafety manual
- Public Health Ontario, test information index
- CCOHS, needlestick injuries
- Public Health Ontario, infectious diseases
- Clinical and Laboratory Standards Institute
- Canadian Ophthalmological Society
- Health Canada, drug product database
- American Academy of Ophthalmology, eye health
Related reading
- Contact lens solutions in Canada vs the US: which rules apply
- Eye clinic consumables: gloves, swabs and tape for optometry
- USB heated eye masks: graphene warm compress for tired eyes
- Face shield vs goggles: choosing eye protection for procedures
CliniEco Medical supplies eye care, laboratory and clinic consumables of the kind described in this article. Health Canada MDEL #35334. This article is written for clinic, procurement and eye care professionals and is not clinical guidance; lens fitting, product selection for a patient and prescribing decisions belong to the treating optometrist or physician.
Frequently Asked Questions
Is a rewetting drop a different device from a multipurpose solution?
In the United States the two share one generic entry, 21 CFR 886.5928, which names lubricating and rewetting alongside cleaning, rinsing, disinfecting and storing. They are therefore the same category of device performing different named functions, and the label, not the ingredient list, is what separates them in the eye.
Does Canada name a rewetting drop in its device rules?
No. The Medical Devices Regulations classify by rule rather than by product name, so a product that contacts the surface of the eye takes a class derived from Schedule 1. The device licence obligation falls on the manufacturer, importer or distributor rather than on the clinic that buys the product.
What should a Canadian clinic ask a supplier for?
The licence evidence behind the product and the establishment licence held by the party placing it on the market. A clinic can also ask for the lens material compatibility statement and the labelled discard period, which are the two facts that most often decide whether a product suits a particular patient.
Why is the preservative system a buying decision?
Because the preservative and the lens polymer interact. A preserved multi-dose bottle depends on its preservative system, while a single-use vial does not, and a patient who has reacted to a preserved system is usually started on an unpreserved format. The compatibility statement on the label names the materials that were tested.
Does the United States prescription release rule apply in Canada?
No. The federal Contact Lens Rule is a United States instrument that places a duty on prescribers there and conditions on sellers. In Canada the comparable expectation comes from provincial college standards, so a Canadian practice should write its release procedure from its own college's standard.
How should a clinic set stock levels for rewetting drops?
Buy against the labelled function rather than by substitution, and keep the two formats apart on the shelf. A lane that stocks one shelf for in-eye drops and another for case care removes the most common cause of a product being used outside its intended purpose.
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