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ENT, Ophthalmic & Sensory
Visionstar GJD-1

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Visionstar ENT, Ophthalmic & Sensory

Visionstar GJD-1

Product Code: EOAS-OD-2525

You read the lens yourself, through the eyepiece

The Visionstar GJD-1 outer reading lensmeter is a manual instrument measuring 0 to plus or minus 25D, with 0.125D graduations below 5D, prism to 5 prism dioptres or 20 with the compensation device, and an adjustable eyepiece fitted. Medigear.uk confirms the full configuration on request.

Sections

Lensmeters

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

The Visionstar GJD-1 is an outer-reading manual lensmeter designed for practices, dispensing rooms, and optical laboratories that prefer to verify lenses by eye rather than rely on an automatic readout, with its dioptric scale on an external drum so the power can be read directly off the instrument. At the same time, the target remains sharp and centred in the eyepiece. Measurement covers a full range of 0 to plus or minus 25 dioptres, wide enough to handle everything from the mildest reading correction through to high-index prescriptions and specialist lenses, with 0.125D graduations below 5D giving the fine resolution needed for accurate work at the low-power end where small discrepancies are most likely to be noticed by the wearer. Prism measurement reads to 5 prism dioptres as standard. It extends to 20 prism dioptres when the compensation device is fitted, covering the great majority of prescribed prism encountered in routine dispensing,g as well as heavier corrections for binocular vision cases. The eyepiece is adjustable, allowing each operator to set focus to their own eye — a practical detail in any setting where several members of staff share a single instrument across a working day, and one that removes a common source of reading error when the same lens is checked by different people. Because the reading is taken directly from a mechanical scale rather than interpreted by electronics, the instrument stays serviceable and calibratable over a long working life, needs no warm-up period, and produces no dependency on software, firmware or a display that can fail. In everyday practice the GJD-1 handles the full range of routine lensmeter tasks: checking sphere, cylinder and axis against a written prescription before a job leaves the workshop, measuring and confirming prescribed prism, locating and marking optical centres ahead of edging and glazing, verifying finished spectacles at collection, and neutralising unknown lenses brought in by patients who have lost their prescription or arrived with an old pair they want matched. It also serves well as a teaching instrument, since the trainee sees and interprets the measurement themselves rather than reading a printed number, which builds an understanding of lens power that automatic equipment tends to bypass. The unit is supplied new, is CE- and ISO-certified, and ships globally through Medigear as a certified professional seller, with the full configuration and any optional accessories confirmed on request.

Manual Optical Reading

The instrument is read through an eyepiece against a graduated scale, with no display, no printer and no data output of any kind fitted to it.

Range to Twenty Five Dioptres

The measuring range is 0 to plus or minus 25D, which covers the ordinary run of spectacle prescriptions a practice is likely to be asked to verify.

Finer Graduation on Weak Lenses

Inner reading graduation is 0.125D up to 0 plus or minus 5D and 0.25D from 5D to 25D, so the weaker half of the range is resolved more finely than the stronger.

Eighth Dioptre Outer Reading

The minimum outer reading is 0.125D, which is an eighth of a dioptre and finer than the quarter step most routine verification is actually carried out at.

Prism and Compensation Device

Prismatic power reads 0 to 5 prism dioptres, extending to 0 to 20 with the prism compensation device in 1 prism dioptre graduations across that range.

Axis and Base Angle

Cylinder axis covers 0 to 180 degrees in 1 degree steps, with prism base angle across 0 to 180 degrees for recording the orientation of a correction.

Adjustable Eyepiece

Eyepiece adjustment is plus or minus 5D, so operators of differing eyesight can share the same instrument without each having to wear their own spectacles.

Wide Objective Acceptance

Objective lens diameter is accepted from 16 to 86mm, and the manufacturer describes wide field of vision observation through the eyepiece of the instrument.

A Second Instrument on the Bench

Practices keep a manual lensmeter beside an automatic one for much the same reason a workshop keeps its hand tools. When the main instrument happens to be away being serviced, or a reading looks implausible and wants checking by another route, an instrument with nothing much to go wrong is what keeps the bench working rather than sending the job out to somebody else entirely for the week.

Teaching and Training

Reading a lens manually teaches exactly what an automatic instrument quietly conceals. A student who has aligned a target and read a scale understands sphere, cylinder and axis as physical quantities rather than numbers appearing on a display alone. For any practice training its staff, or a teaching department, that understanding survives long after the particular instrument has itself been replaced.

Prismatic Verification

Prism reads to 5 prism dioptres directly, and to 20 with the compensation device fitted, with base angle across the full 180 degrees. For a practice that dispenses prism occasionally rather than routinely, a manual instrument covers that work without the outlay of a whole automatic machine kept largely for the sake of a handful of jobs each year at all.

Settings Without Reliable Power

A manual instrument depends upon nothing at all but its bulb, which is rated at 3V and 3W. For clinics working where mains supply is intermittent, or for equipment that must survive being moved and stored between uses, an optical instrument with no electronics to age is a considerably safer proposition than a machine full of circuit boards inside it.

Nothing to Fail

There is no software, no calibration cycle, and no sensor drift at all. A well made optical instrument of this kind remains serviceable for decades with nothing more than an occasional replacement bulb, which is why manual lensmeters bought long ago are still standing upon benches today. Against a machine that may be unsupported in ten years, that longevity is well worth weighing up properly, and not simply dismissing out of hand.

Finer Where It Matters

Graduation of 0.125D below 5D is finer than the quarter step that most routine verification uses, and it falls exactly where the fine reading counts most. A small absolute error on a weak lens is a large relative one, so resolving the weaker half of the range more closely than the stronger is a sensible piece of design rather than an arbitrary division of the scale itself.

Shared Without Adjustment Arguments

An eyepiece adjustment of plus or minus 5D means operators of quite different eyesight use the same instrument without spectacles, and without recalibrating anything at all between them. On a shared bench that removes a small daily friction, and the small daily frictions are what determine whether a piece of equipment gets used or quietly avoided by half of the staff altogether.

The Visionstar GJD-1 is a manual lensmeter measuring 0 to plus or minus 25D, with a minimum outer reading of 0.125D and inner reading graduation of 0.125D up to 0 plus or minus 5D and 0.25D from 5D to 25D. Cylinder axis covers 0 to 180 degrees in 1 degree steps and prism base angle 0 to 180 degrees. Prismatic power reads 0 to 5 prism dioptres, extending to 0 to 20 with the prism compensation device in 1 prism dioptre graduations. Eyepiece adjustment is plus or minus 5D, objective lens diameter is accepted from 16 to 86mm, and the lighting bulb is rated at 3V and 3W.

Three points are stated plainly. This is a manual instrument with no display, printer or data output, so the operator reads the value directly. Whether the prism compensation device is supplied with the instrument or ordered alongside it is not stated on the card. And a second designation appears in brackets beside the model number, which reads as an alternative name rather than a second product but is worth confirming. The mains supply specification is not reproduced here.

If your practice wants a second instrument for the bench, a tool for training staff, or something that works without depending on electronics, speak to Medigear.uk. As a verified medical equipment supplier working across medical, dental, rehabilitation and aquatic therapy settings, the team will confirm what is supplied.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

No, it is not. It is a manual lensmeter, read through an eyepiece against a graduated scale. There is no display, no printer and no data output, so the operator aligns the target and reads the value directly, with no instrument interpreting the lens on their behalf, which is the whole nature of the instrument.

It measures 0 to plus or minus 25D, with a minimum outer reading of just 0.125D. Inner reading graduation is 0.125D up to 0 plus or minus 5D, and then 0.25D from 5D out to 25D, so the weaker half of the range is resolved more finely than the stronger half of it is.

Because a small absolute error upon a weak lens is a very large relative one. An eighth of a dioptre read as a quarter matters far more upon a weak prescription than it does upon a strong one, so resolving the weaker half more closely is a sensible piece of design in an instrument of exactly this kind.

The prismatic power reads 0 to 5 prism dioptres in prism dioptre graduations, extending to 0 to 20 prism dioptres with the prism compensation device fitted, in 1 prism dioptre graduations. Prism base angle covers 0 to 180 degrees right across the whole of its stated arc.

The card simply does not say. It describes the extended prism range as being available with the prism compensation device, without stating whether that device is supplied with the instrument or bought alongside it, so this should be established with Medigear.uk directly, since it changes what the instrument can measure.

Yes. Eyepiece adjustment is plus or minus 5D, so staff whose eyesight varies can each use the instrument without wearing their own spectacles, and without anything at all needing recalibration between one operator and the next one who comes along to use it after them.

The objective lens diameter is accepted from 16 to 86mm, and the manufacturer also describes a wide field of vision observation through the eyepiece. That covers small rimless lenses at one end and the larger uncut blanks at the other end of that stated range.

A second designation appears in brackets beside the model number upon the card. That reads as an alternative name for the very same instrument, and not as a separate product, but the material does not say so explicitly, so it is worth confirming with Medigear.uk beforehand.