Optokinetic Drums in Canada vs the US: Which Class Applies?

Quick facts

• An optokinetic drum is a rotating cylinder lined with alternating stripes; the eye follows the moving field, and the induced response is the sign the clinician reads.
• In the United States it files under 21 CFR 886.1200, Optokinetic drum, at Class I, product code HOW.
• In Canada there is no named entry; a motorised drum is an active diagnostic device at Class II under Rule 10(1) of Schedule 1.
• Rule 10(2) would lift it to Class III only where an erroneous reading could cause immediate danger; a screening or elicited-response test does not carry that consequence.
• A printed cloth drum turned by hand and a motorised drum on a stand are the same device family; the class follows the function, not the drive.
• Entries, classes and product codes below were checked against the eCFR, the Regulations and the openFDA classification database on 2026-10-13.

An optokinetic drum is a rotating cylinder whose inner surface carries alternating light and dark stripes. When the drum turns, the striped field moves across the patient's vision and the eyes follow it, producing an optokinetic response that the clinician observes. The instrument is used in the assessment of visual tracking, in the study of involuntary eye movement, and as a stimulus in paediatric vision testing. In the United States it sits in a named regulation number at Class I; in Canada the moving stimulus makes it an active diagnostic device at Class II. This article sets out both routes and the records the test supports, with the pre-perforated exam table roll that covers the testing chair.

What is an optokinetic drum?

It is a cylinder with a striped or checked surface on the inside, mounted so it can spin about a vertical axis. The patient watches the moving pattern across the whole visual field. As the field moves in one direction the eyes follow it and then flick back, and the pattern of that following-and-flicking is the optokinetic response. The drum can also be a flat striped belt or a projection, but the function is the same: a wide, moving patterned field.

Because the stimulus fills the field rather than a small target, the response is driven by the whole retina, which is what makes the test useful where a foveal test would not hold the patient's attention. The drum's speed and direction are the variables the clinician sets, so the record keeps the rotation speed and the direction tested alongside what was observed.

Is an optokinetic drum a Class I device in the United States?

Yes. 21 CFR 886.1200 is titled Optokinetic drum and the entry sits at Class I. The openFDA device classification API lists product code HOW under that regulation number. A Class I device of this kind reaches the market under general controls — establishment registration, labelling rules and good manufacturing practice — rather than a premarket review of the individual instrument.

The entry describes the moving-field function, not the drive. A motorised drum on a stand, a hand-turned cloth drum and a belt device used for the same eliciting task are described by the same number, because the class attaches to the stimulus the device presents rather than to the mechanism that turns it.

Item	Detail
US regulation	21 CFR 886.1200 - Optokinetic drum
US class	Class I (general controls)
Product code	HOW
Route to market	Registration and listing; general controls
Applied part	No contact with the eye; the subject watches a moving patterned field

How does Canada classify an optokinetic drum?

Canada keeps no named entry, so the class is derived from Schedule 1 of the Medical Devices Regulations. The governing rule is Rule 10(1): "Subject to subrule (2), an active diagnostic device, including any dedicated software, that supplies energy for the purpose of imaging or monitoring physiological processes is classified as Class II." A drum that is driven — by a motor or by hand — presents a moving optical stimulus and, through it, monitors the induced eye response, so the instrument is an active diagnostic device and falls on the Class II default of Rule 10(1).

Rule 10(2) is the subrule to read next: it lifts the class to III only where the device is intended to monitor, assess or diagnose a condition and erroneous readings could result in immediate danger. An optokinetic drum elicits and displays a response for the clinician to interpret; it does not itself issue a reading that could put a patient in immediate danger, so the Class III lift does not apply. Rule 7(1) is the near miss — the general Class I default for a non-invasive device — and it does not govern because the instrument is active.

Item	Canada	United States
Named entry	None; classified by rule	886.1200, Class I
Class	Class II (Rule 10(1))	Class I (general controls)
Governing text	Schedule 1, Rule 10(1)	21 CFR 886.1200
Route to market	Device licence (Class II) with ISO 13485 evidence	Registration and listing
Would Rule 10(2) apply?	No; the elicited response is not an immediate-danger reading	Handled inside the Class I entry

How does this differ from other eye-movement tests?

These instruments are often kept in the same cupboard and are ordered together, but they are not the same device and the class is derived for each in its own terms. A drum presents a wide moving field and relies on the observer; a recording eye-movement monitor captures the movement electronically; a fixation target holds the eye still. The class follows the intended use, so a display device and a recording device are described separately.

Instrument	What it does	Output	Class, Canada	Class, US
Optokinetic drum	Presents a wide moving patterned field	Observed response	II (Rule 10(1))	I (886.1200)
Eye-movement monitor	Records the eye position over time	Trace or measurement	II (Rule 10(1))	886.1460 range
Fixation target	Holds attention on a point	Cooperation, not a measurement	I (Rule 7(1)) if passive	I

The detail worth carrying into a purchase order is the applied part and the drive. None of these touches the eye, so the rules on contact with the surface of the eye do not apply; what moves the class in Canada is whether the instrument is active, and a drum with its own drive is. A practice that buys a hand-turned cloth drum used only as a passive display should confirm the intended use on the labelling, because that is what the class attaches to.

What should a clinic check before ordering one?

Three checks. First, confirm whether the drum is driven — by a motor or by hand — because that is the fact that decides the Canadian route. Second, confirm the exact regulation number and product code on the supplier's labelling. Third, confirm the intended clinical task — eliciting a response that a clinician observes, or capturing a recording that a device produces — because the record the clinic keeps and the class both turn on that distinction.

A paediatric or neuro-ophthalmic service also reorders the room consumables that sit at the same testing chair. Clinics that stock for a whole practice can order through the wholesale programme and request a bulk quote for a standing or annual order; the pre-perforated exam table roll sits in the same catalogue. Reselling? become a distributor.

How does the class affect a clinic's testing routine?

The class sets the licence path to market; the routine is the clinic's own. A test is recorded with the instrument used, the direction and speed tested, and what was observed, so a repeat test can be compared with the earlier one when the question is whether the response has changed. Where the drum is used with a recording device, the trace is filed with the session note.

Because the patient's attention is the stimulus's partner, the routine also depends on a quiet room and a clear explanation, particularly with younger patients. None of that changes with the class; it is the ordinary routine a patient-contact diagnostic service keeps, and the record is what shows the test was run as the maker intended.

Sources

1. openFDA device classification API
2. Medical Devices Regulations, SOR/98-282, full text and Schedule 1
3. US FDA, medical device databases
4. US FDA, overview of device regulation
5. Health Canada, medical devices
6. Health Canada, establishment licensing
7. Standards Council of Canada
8. CSA Group
9. ISO 13485:2016, medical devices quality management
10. ISO 14971:2019, application of risk management to medical devices
11. Canadian Association of Optometrists
12. College of Optometrists of Ontario, standards of practice
13. US FDA, medical devices overview
14. CCOHS, OSH answers
15. Public Health Ontario, infection prevention and control
16. ISO 15004-1:2020, ophthalmic instruments, general requirements
17. ISO 17664:2017, processing of health care products - information to be provided
18. Canadian Orthoptic Society, clinical resources
19. Health Canada, medical device licence application guidance

Printable record sheet. A vision-testing service runs on session records, and a printed sheet is the copy the clinic can file with the patient's notes. Open the sterilization log sheet library — the downloadable pack holds a steam-cycle log, a reprocessing-room checklist and an equipment-maintenance sheet. No account and no sign-up; print as many copies as your log needs.

Log generator. Enter the clinic name, the instrument and the test protocol once and the generator lays out a dated testing sheet ready for the quality manual. Run the sterilization log generator to build a dated, facility-labelled cycle sheet you can print or file straight into your quality manual.

Ask a compliance specialist. Whether a moving-field instrument is Class I or Class II in Canada turns on whether it is active; a written answer keyed to your drum and province settles it. Ask a compliance specialist — you get a written answer specific to your equipment and province, with the regulation or standard it is based on cited.

Related reading

• Eye-movement monitors in Canada vs the US
• Ophthalmic cameras in Canada vs the US
• Vision screeners in Canada vs the US

CliniEco Medical supplies eye care, laboratory and dental consumables of the kind described in this article. MDEL #35334. This article is written for optometry, laboratory and dental procurement professionals and is not legal advice; the class of a device and the records a practice keeps belong to the manufacturer and to the requirements that apply to it.

Frequently Asked Questions

What class is an optokinetic drum in the United States?

Class I, under 21 CFR 886.1200, Optokinetic drum, product code HOW.

What class is it in Canada?

Class II, through Rule 10(1) of Schedule 1 of the Medical Devices Regulations, as an active diagnostic device that supplies a moving optical stimulus to the patient.

Does the class differ between the two countries?

Yes. The United States names the drum in a Class I regulation; Canada derives Class II from the rule for active diagnostic devices, because the driven drum delivers energy to the eye.

Does a hand-turned drum stay Class I in Canada?

The class turns on the intended use and whether the device is active. A driven drum used to elicit a response is read as an active diagnostic device; the labelling's intended use is what the class attaches to.

What else is an optokinetic drum called?

It is also written as OKN drum, optokinetic nystagmus drum, and optokinetic strip or belt device where the pattern is carried on a flat carrier.

Does the clinic need a recording device as well?

Not necessarily. A drum can be used with an observer alone; a recording eye-movement monitor is a separate device with its own entry, and the trace is a separate record.