Synoptophore: What It Does and What to Check Before Buying

The synoptophore — also called a major amblyoscope — is the defining instrument of an orthoptic clinic, and one of the few pieces of ophthalmic equipment that relatively few manufacturers still build. That makes it a hard instrument to source and an easy one to under-specify. This guide covers what it is and what to confirm before ordering.

For the wider room it sits in, see our orthoptic and squint clinic instruments guide.

How the instrument is built

A synoptophore presents a separate illuminated image to each eye through two tubes on independently movable arms. Because each eye’s target can be positioned on its own, the examiner can set the arms to the patient’s deviation and read the result off a calibrated scale.

The LED synoptophore is used for measuring the angle of squint, assessing binocular single vision and fusion, and for orthoptic exercises.

The parts that determine whether a given unit is any good:

The arms and their scales — this is the measuring mechanism.
The slides — they define what the instrument can actually be used for.
The illumination — stable, even light in both tubes.
The chinrest and headrest — patient positioning, often paediatric.

What to check before ordering

Which slides are included. This is the single most important question, and the one most often left vague on a quote. Slides are what the instrument does; a unit supplied with a minimal set will need supplementing.
LED or lamp illumination. LED runs cooler and removes bulb replacement from the picture. Confirm which is fitted.
Calibration. Ask how the arms and scales are calibrated, and what check method is supplied so the clinic can verify in service.
Mains voltage and plug type for your country.
Table height. It is a benchtop instrument used with a seated patient — confirm the working height suits both patient and examiner, especially for children.
Spares. Ask what is available, since this is a long-service-life instrument.

Who orders one

A synoptophore is a one-per-room purchase, not a stocked line:

Paediatric eye hospitals, where squint and amblyopia work is core caseload.
Teaching hospitals and optometry schools, which buy for demonstration as well as clinic use.
General eye hospitals adding a squint service — usually a single room project ordered all at once: synoptophore, prism bar set, trial lens set and a near target such as a near vision drum.

That last pattern is the common one, and it is worth quoting as a complete room rather than as a single instrument.

A note on sourcing

Because few manufacturers still produce synoptophores, buyers often find long lead times or resellers quoting on units they do not make. Buying from the manufacturer matters more here than in most categories — for lead time, for spares, and for being able to ask a real question about calibration. See buying direct from the manufacturer.

Assessment technique and interpretation are clinical matters for the orthoptist or ophthalmologist. This guide covers specification and procurement only.

Source direct

Optolab Zone manufactures and exports synoptophores and the full ophthalmic range from Ambala, India. Tell us the slide set and destination and we’ll quote with export terms. Request a quote or message us on WhatsApp.