Quick facts
- Age-related macular degeneration is found in an exam, not on a test strip. There is no single laboratory marker; the finding comes from a dilated retinal examination, supplemented by imaging and by a patient-held grid used between visits.
- The devices used are classified, and the classes differ by function. In the United States a general-use ophthalmic camera is Class II (special controls), a visual acuity chart is Class I, an ophthalmoscope is Class II, and a Haidinger brush, the instrument behind a macular integrity check, is Class I.
- Canada has no equivalent named entries. The same instruments take a derived class under the Medical Devices Regulations, and the licence obligation follows that derived class rather than a US-style product code.
- The two countries differ most on who pays for the examination. Ontario's OHIP schedule covers a full eye examination once every 12 months for residents aged 65 and older with a valid health card, which is the age band in which macular degeneration becomes a routine finding.
- The patient's own test matters between visits. A grid held at home on a defined schedule is what turns an annual examination into continuous surveillance, and the instruction the patient leaves with is part of the record.
- Screening is risk-shaped, not universal. Both systems route the frequency of examination by age, family history, smoking status and other risk factors rather than by a single population rule.
Age-related macular degeneration sits in the middle of a supply discussion that is often framed as a product question. The devices involved — a chart, a camera, a scope, a grid — are all classified medical devices in the United States, and all derived-class devices in Canada, but none of them is what actually decides whether a patient is followed.
What decides it is the examination schedule and who pays for the visit. This article covers what screening for macular degeneration involves, how each country classifies the instruments, how the funded entry point differs, and what a clinic must hold on the shelf to run the schedule it has promised its patients.
What does screening for macular degeneration actually involve?
Screening here means looking for the disease before the patient reports distortion, and it has three layers.
- The examination itself. Dilated retinal examination with a scope is the core step, and it is the point at which drusen and pigmentary change are seen rather than inferred.
- Imaging and documentation. A camera or an imaging device records the fundus so that a later change is compared against a baseline image rather than a written impression.
- The interval test the patient holds. A grid used at home on a fixed schedule detects new distortion between the scheduled visits, and it is prescribed with an instruction rather than handed over.
The clinical ordering matters for procurement, because the three layers fail in different ways. An imaging device that is not calibrated produces images that cannot be compared over time; a grid handed over without instruction is not used; and an examination that is not funded does not happen at all.
How do the two countries classify the instruments?
The classification differences are functional: the United States writes an entry per instrument type, and Canada derives a class from the rules.
| Item | Canada | United States |
|---|---|---|
| Named entry for a fundus or ophthalmic camera | None; class derived from the rules | 21 CFR 886.1120, ophthalmic camera |
| Named entry for a visual acuity chart | None; class derived from the rules | 21 CFR 886.1150, visual acuity chart |
| Named entry for a macular integrity instrument | None; class derived from the rules | 21 CFR 886.1090, Haidinger brush |
| Class of a general-use camera | Derived (Class I to IV by rule) | Class II (special controls) |
| Class of a printed acuity chart | Derived (Class I to IV by rule) | Class I (general controls) |
| Premarket route in practice | Device licence where the derived class requires it | Premarket notification, with exemptions inside the entry |
| Who is funded to perform the examination | Insured for residents 65 and older, once every 12 months | Plan-dependent for routine eye examinations |
Two consequences follow for a buyer. First, an imaging device carries the heavier filing in the United States while a chart does not, so the same clinic can hold one Class II instrument and several Class I ones in the same room. Second, in Canada the question is not which entry applies but which derived class applies, which is why a Canadian purchase decision should be settled against the device licence behind the product and the establishment licence of the party placing it on the Canadian market.
| Test or instrument | What it shows | US entry and class |
|---|---|---|
| Dilated retinal examination | Drusen, pigmentary change, haemorrhage | 21 CFR 886.1570, ophthalmoscope, Class II |
| Fundus imaging | Baseline and serial images for comparison | 21 CFR 886.1120, ophthalmic camera, Class II |
| Visual acuity | Central function, tracked over time | 21 CFR 886.1150, visual acuity chart, Class I |
| Macular integrity check | Central field function | 21 CFR 886.1090, Haidinger brush, Class I |
| Refraction | Whether reduced acuity is optical or retinal | 21 CFR 886.1760, ophthalmic refractometer, Class I |
| Intraocular pressure | Coexisting glaucoma risk | 21 CFR 886.1930, tonometer, Class II |
Who is funded to have the examination?
This is the sharpest difference between the two systems, and it is about the funded entry point rather than about clinical practice.
In Ontario, the OHIP schedule covers a full eye examination once every 12 months for residents aged 65 and older who hold a valid health card, and the College of Optometrists of Ontario publishes the funding options that apply to examinations performed in the province. The practical effect is that the age band in which macular degeneration becomes a routine finding is also the age band in which the examination is publicly funded, so the surveillance schedule is not gated by the patient's decision to pay.
In the United States, coverage for a routine eye examination is a function of the patient's plan rather than a universal schedule, which is why US clinical guidance is written to two audiences at once: the clinician, and the primary care or chronic disease pathway where a patient with diabetes or a family history is already being seen. That difference changes what a clinic has to do at the front desk. A Canadian clinic in the 65-plus band can schedule the annual examination as a funded recall; a US clinic cannot assume the same scheduling logic.
How is the surveillance schedule documented?
Both systems rely on the same record, and the record is what makes a change detectable.
- The baseline. Acuity, refraction, intraocular pressure and the retinal findings at the first visit, with the imaging stored where the next practitioner can find it.
- The interval test. Which grid, how often, and what the patient is told to do if the lines distort — the instruction is part of the prescription, not a leaflet.
- The review interval and its trigger. The date of the next examination together with the risk factors that set it, so that the interval can be justified if the record is reviewed.
- The devices used, with their identifiers. Calibration and software versions belong in the record for any imaging device, because a comparison across a software change is not a like-for-like comparison.
That last item is the one that most often goes missing in practice and the one that costs the most when it does: an image series that cannot be compared with the series taken before a device change is a new baseline, not a follow-up.
What must a clinic hold on the shelf?
The consumable side of an ophthalmic screening room is small but it is consumed at every visit.
- Lane surfaces. Exam table paper is changed between patients on the examination unit, and it is the item that disappears fastest in a high-volume screening clinic.
- Contact and hygiene items. Nitrile examination gloves are worn for every examination that involves lid contact, and swabs and wipes are consumed in the external eye examination.
- Aids to the examination itself. Disposable tongue depressors are a practical item in the examination of the lids and canthal area, and clear anti-fog face shields protect staff working close to the patient's face at the slit lamp.
Because the schedule runs on calendar dates rather than on symptoms, the consumable demand of a screening room is unusually predictable: visits per day multiplied by items per visit, with very little seasonal variation. That predictability is what makes this lane a good candidate for a standing order rather than an as-needed reorder.
Sources
- 21 CFR 886.1120, ophthalmic camera
- 21 CFR 886.1150, visual acuity chart
- 21 CFR 886.1090, Haidinger brush
- 21 CFR 886.1570, ophthalmoscope
- 21 CFR 886.1760, ophthalmic refractometer
- 21 CFR 886.1930, tonometer and accessories
- 21 CFR 886.9, limitations of exemptions from section 510(k)
- American Academy of Ophthalmology, age-related macular degeneration
- American Academy of Ophthalmology, what is macular degeneration
- American Academy of Ophthalmology, AMD treatment
- American Optometric Association, age-related macular degeneration
- American Optometric Association, macular degeneration
- National Eye Institute, age-related macular degeneration
- Ontario, what OHIP covers
- College of Optometrists of Ontario, funding options for eye examinations
- College of Optometrists of Ontario
- Canadian Association of Optometrists, eye health library
- World Health Organization, blindness and visual impairment
- International Agency for the Prevention of Blindness, Vision Atlas
- ISO 15004-1:2020, ophthalmic instruments, fundamental requirements
- Medical Devices Regulations, SOR/98-282
- American Academy of Ophthalmology, eye exam frequency
Ordering for an optometry group, ophthalmology practice or screening clinic? Wholesale and multi-site ordering covers account setup and case pricing, and the B2B wholesale collection lists the lines stocked for institutional buyers. Practices that reprocess instruments can start with the biological indicator 5-pack trial and read the sterilization monitoring collection for the monitoring lines.
Related reading
- Comprehensive eye check-ups in Canada vs the US: which exam interval applies
- Eye charts in Canada vs the US: which optotype standard applies
- Eye clinic consumables: gloves, swabs and tape for optometry
- Eye patches in Canada vs the US: which types and coverage routes apply
Frequently Asked Questions
Is there a blood test for macular degeneration screening?
No. Age-related macular degeneration is identified from the retina itself, through a dilated examination supported by imaging that can be compared over time. Blood work plays no part in the screening pathway, which is why the equipment in an ophthalmic screening room is classified as ophthalmic devices rather than as in vitro diagnostic devices.
How are the tests classified in the United States?
The United States classifies by instrument type. A general-use ophthalmic camera is Class II with special controls under 21 CFR 886.1120, an ophthalmoscope is Class II under 21 CFR 886.1570, and a tonometer is Class II under 21 CFR 886.1930, while a printed visual acuity chart is Class I under 21 CFR 886.1150 and a Haidinger brush is Class I under 21 CFR 886.1090.
How does Canada classify the same instruments?
Canada does not maintain named entries for these instruments. Each takes a class derived from the rules in the Medical Devices Regulations, and the licence obligation follows from that derived class. For a buyer, the practical checks are the device licence behind the product and the establishment licence held by the party placing it on the Canadian market.
Does health insurance cover the examination that would find it?
In Ontario, the OHIP schedule covers a full eye examination once every 12 months for residents aged 65 and older with a valid health card, and the College of Optometrists of Ontario publishes the funding options that apply in the province. In the United States, coverage for a routine eye examination depends on the patient's plan, so surveillance is often driven through chronic disease and primary care pathways rather than a universal recall.
What should the patient use between scheduled examinations?
A grid used at home on a set schedule. The clinical value comes from the instruction that accompanies it and from the interval being recorded in the chart, because a grid handed over without a schedule and without a documented action step produces no earlier detection than waiting for the next appointment.
What does a screening room consume at every visit?
Exam table paper changed between patients on the examination unit, gloves for any examination involving lid contact, and swabs or wipes used in the external eye examination. Face shields are held for staff working at the slit lamp. Because the schedule runs on calendar dates, this demand is unusually predictable, which makes a standing order practical.
CliniEco Medical supplies clinic, optometry and laboratory consumables of the kind described in this article. Health Canada MDEL #35334. This article is written for clinic, optometry and procurement professionals and is not clinical guidance; diagnosis, examination intervals and treatment belong to the treating optometrist or ophthalmologist.
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