Written and maintained by CASRAI Editorial Board
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Short answer: an electronic magnifier, also called a video magnifier, is a closed-circuit television (CCTV) system: a camera captures reading material and shows it enlarged on a monitor, television or computer screen. In the United States, FDA regulation 21 CFR 886.5820 classifies the reading-system version as Class I (general controls) and exempt from premarket notification. This page is general product information, not medical advice.
Definition and scope
The American Foundation for the Blind (AFB) describes a video magnifier as a closed-circuit television system that uses a stand-mounted or handheld video camera to project a magnified image onto a video monitor, a television screen or a computer monitor. FDA’s own definition in 21 CFR 886.5820, titled “Closed-circuit television reading system,” is a device that consists of a lens, video camera and video monitor, intended for use by a patient who has subnormal vision to magnify reading material.
That makes the electronic magnifier a different product class from the optical handheld magnifier and from bioptic glasses, which are worn optics. Both the regulatory definition and the AFB description centre on a camera feeding a screen.
How a video magnifier is used in practice
AFB explains that cameras with zoom lenses provide variable magnification, and that in most systems magnification and focus are set after choosing a comfortable working distance between the camera and the material. Some systems use an auto-focus camera, while lower-cost units often use a fixed-focus camera that cannot vary magnification or camera-to-target distance. Most cameras also need their own light source.
Stand-mounted systems
The camera is fixed on a stand and the reading material is placed under it and moved across and down the page. Most stand-mounted cameras use an x-y table, a table that moves top to bottom and side to side. AFB notes they are particularly effective for handwriting because a hand can fit under the camera.
Handheld systems
The camera is brought to the material. AFB says handheld cameras can magnify almost anything within reach, including labels on packages of food and medicine, are often on rollers for moving across a flat surface, and some manufacturers offer a writing stand as an accessory.
Other forms
AFB also lists head-mounted displays, which offer portability and new ways of viewing the display, and systems that work with a computer by sharing the computer monitor. Image capture and saving is described as a newer function.
Types and related regulations
Three FDA regulations in 21 CFR Part 886 sound similar but describe different devices. Each row below paraphrases the regulation text as published in the eCFR (Cornell Legal Information Institute copy, checked 2026-10-31).
| Regulation | Device name | What the regulation says it is | Class |
|---|---|---|---|
| 21 CFR 886.5820 | Closed-circuit television reading system | Lens, video camera and video monitor, to magnify reading material for a patient with subnormal vision | Class I, exempt from premarket notification (subject to 886.9 limits) |
| 21 CFR 886.5900 | Electronic vision aid | AC- or battery-powered device with an electronic sensor/transducer that translates visual images of objects into tactile or auditory signals, for a patient with impaired vision or blindness | Class I, exempt from premarket notification (subject to 886.9 limits) |
| 21 CFR 886.5540 | Low-vision magnifier | A magnifying lens, which may be held in the hand or attached to spectacles | Class I, exempt from premarket notification (subject to 886.9 limits) |
Where it matters for labs, clinics and supply decisions
Staff who source or document low-vision aids can use the table to name the correct device category before comparing products. The medical device definition and the unique device identifier rules explain the wider framework these Class I entries sit in.
A checklist drawn only from AFB’s description of the product category:
- Task: AFB associates handwriting under the camera with stand-mounted cameras on an x-y table, and labels or items within reach with handheld cameras.
- Display: whether the unit shows on its own monitor, a television or a shared computer monitor.
- Viewing modes: black-on-white or white-on-black text, contrast and brightness controls, and colour modes where colour matters, such as maps and colour photographs.
- Focus: auto-focus versus fixed focus, and whether magnification and camera distance can vary.
- Lighting: whether the camera needs its own light source.
Common misunderstandings
“Electronic vision aid” is not a screen magnifier. In FDA terms, 21 CFR 886.5900 covers a sensor-based device that outputs tactile or auditory signals. A camera-and-monitor video magnifier is described in 886.5820.
Class I does not mean unregulated. General controls still apply; the regulation says the exemption from premarket notification is subject to the limitations in 21 CFR 886.9.
A video magnifier is not the same as an optical magnifier. An optical low-vision magnifier is a magnifying lens; a video magnifier adds a camera and a display.
FAQ
What is the difference between an electronic magnifier and a video magnifier?
The terms describe the same product category here: a camera-based system that displays magnified material on a screen. AFB uses “video magnifier” and “closed-circuit television (CCTV) system” together.
Is a video magnifier an FDA-regulated device?
Yes. 21 CFR 886.5820 defines the closed-circuit television reading system and classifies it as Class I (general controls), exempt from the premarket notification procedures in subpart E of part 807, subject to the limitations in 886.9.
Which video magnifier type does AFB link to handwriting?
AFB describes stand-mounted cameras as particularly effective for handwriting because a hand can fit under the camera.
Sources
- American Foundation for the Blind, Video Magnifiers, checked 2026-10-31.
- 21 CFR 886.5820, Closed-circuit television reading system, checked 2026-10-31.
- 21 CFR 886.5900, Electronic vision aid, checked 2026-10-31.
- 21 CFR 886.5540, Low-vision magnifier, checked 2026-10-31.
