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ENT, Ophthalmic & Sensory
Visionstar TF-4880B

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Visionstar ENT, Ophthalmic & Sensory

Visionstar TF-4880B

Product Code: EOAS-OAVT-3364

Forty-eight to eighty millimetres, with the axis printed where you can read it.

A cylinder is only as good as the axis you can record. The TF-4880B spans 48 to 80 mm, rotates each cell through 360°, and carries calibration scales on both sides.

Sections

Trial Lens Sets & Frames

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

The Visionstar TF-4880B is a trial frame with the widest interpupillary span Visionstar publishes: 48 to 80 mm. The data also gives four trial lenses per side, adjustable leg length, 360° lens rotation, and axial calibration printed on each cell.

The span is the headline. Reaching 48 mm at the narrow end covers children and narrow-set adults, while 80 mm covers adults well outside the usual range, so one frame serves a patient population that would otherwise need two. For a practice holding a single adjustable frame, that breadth is the practical argument.

The axial calibration matters as much. A cylinder recorded at the wrong axis is a prescription that cannot be reproduced, and a printed scale around each cell lets the clinician read the setting rather than estimate it. The published figures are unusual and asymmetric: left −120° to 0° to 135°, right −45° to 180° to 60°. Those read as descriptions of the scale markings on each side rather than as travel limits, particularly since 360° rotation is listed separately. Medigear.uk confirms exactly what they denote before supply, since a scale a clinician misreads is worse than no scale.

Adjustable leg length is the third feature, and it is what makes a frame sit level on different head shapes. A frame riding high or low changes the vertex distance and the optical centre height together, so the adjustment affects the result rather than only comfort.

Unpublished are the frame weight, cell diameter, vertex distance and pantoscopic tilt ranges, material, and whether a case or lens set is included. The first sheet in this series lists a frame at 48–80 mm and 65 g without a model code; that figure is almost certainly this model's weight, and we confirm it rather than assume it.

Practices holding one adjustable frame benefit most. A 48 to 80 mm span covers children, narrow-set adults and wide-set adults from a single frame, which is the case for buying this model rather than two.

Cylinder refinement suits the printed calibration and full rotation, since small axis changes can be made and read directly rather than estimated between marks.

Record-keeping is the underlying argument. The GOC expects clear, reproducible records, and an axis read from a scale is reproducible in a way an estimate is not.

Paediatric refraction is served by the 48 mm lower limit, with the leg adjustment helping the frame sit level on a smaller head.

High prescriptions depend on the frame sitting correctly, so adjustable leg length matters alongside vertex distance, which we confirm separately.

Domiciliary and low vision work suit a frame that covers every patient a clinician might meet in a day without carrying alternatives.

Teaching clinics can use the visible scales to show students what axis setting means, which a phoropter hides inside the instrument.

Screening at speed is better served by a fixed-pupil set, since this frame is adjusted for each patient rather than selected.

The widest span published

At 48 to 80 mm, one frame covers children, narrow-set adults and wide-set adults alike.

Axis you can read

Printed calibration on each cell turns a judged setting into a recorded one.

Full circular travel

360° rotation reaches any axis without removing and reinserting a lens.

Reproducible prescriptions

A recorded axis can be repeated at the next visit or by a colleague.

Sits level on different heads

Adjustable leg length keeps the frame square, which affects the correction as well as comfort.

Four lenses per side

Sphere, cylinder, prism and an auxiliary lens can all be in place together.

One frame instead of two

Breadth of range suits a practice that wants a single adjustable frame to cover its whole list.

Suits teaching

Visible scales show students exactly what a cylinder axis is, which an instrument conceals.

Its ambiguity flagged

The unusual published calibration figures are identified here as something to clarify, not repeated as fact.

48–80 mm interpupillary adjustment

The widest published range in this series.

Axial calibration on each cell

Printed scales on both sides. Published as left −120° to 0° to 135°, right −45° to 180° to 60°; meaning confirmed at order.

360° lens rotation

Each cell turns a full circle.

Adjustable leg length

Temple length adjusts to suit different head shapes.

Four lenses per side

Four cells each side accept lenses simultaneously.

Weight

Not published on this sheet. A companion sheet suggests 65 g; confirmed in writing.

Cell diameter

Not published. Confirmed against your trial lens set at order.

Vertex distance adjustment

Indicated by frame type; range not published. Confirmed at order.

Pantoscopic tilt

Indicated by frame type; range not published. Confirmed at order.

Frame material and finish

Not specified. Confirmed at order.

Case

Not stated. Confirmed at quotation.

Trial lens set

Not stated as included. Confirmed at quotation.

The Visionstar TF-4880B is the broadest and most instrumented frame in this range: 48 to 80 mm of interpupillary adjustment, four lenses per side, adjustable leg length, 360° cell rotation and printed axial calibration on both sides. The span means one frame covers children and wide-set adults alike, and the scales mean the axis is recorded rather than estimated, which is what makes a prescription reproducible. Two things need settling first: what the asymmetric published calibration figures actually denote, since they read as scale markings rather than travel limits, and the cell diameter against the trial lens set you already own. Medigear.uk confirms both in writing, along with weight, vertex and tilt ranges and case contents. Contact the Medigear.uk team for pricing.

FAQ

Frequently Asked Questions

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

Wider than most. At 48 mm it narrows enough for children and small adults; at 80 mm it opens further than the great majority of adults require. A practice buying one adjustable frame to cover everyone has a strong case for this model.

A reading rather than an estimate. Cylinder axis has to be recorded accurately or the prescription cannot be reproduced at the next visit or by a colleague, and a printed scale around the cell removes the guesswork.

That is the question we put to the manufacturer. As published they are asymmetric, left −120° to 0° to 135° and right −45° to 180° to 60°, which most likely describes how the scale is printed on each side rather than any limit on movement, since full 360° rotation is stated separately. We confirm the meaning in writing before supply.

The cell turns a full circle, so any axis can be reached without removing and reinserting a lens. That is a practical benefit when refining a cylinder through small changes.

Because it sets how the frame sits. A frame riding too high or too low shifts both the vertex distance and the optical centre height, which changes the effective correction, particularly at higher powers. Adjustable legs let the frame sit level on different head shapes.

Not published on this sheet. A companion sheet lists an unlabelled frame at 48–80 mm and 65 g, which is almost certainly this model, and we confirm the figure in writing rather than presenting an inference as fact.

Not published. Trial lenses are commonly 38 mm, and the frame must match the set you own. We confirm the cell diameter before you order.

The frame type and the photographs suggest so, and adjusters are visible at the temples and bridge, but the ranges are not published. We confirm what adjusts and by how much.

Better than most, thanks to the 48 mm lower limit. Whether it suits a particular child depends on their measurement and on how the frame sits, which the leg adjustment helps with.

Not stated. We confirm exactly what is included at quotation rather than leaving it to assumption.

A trial frame is generally a Class I medical device under the UK Medical Devices Regulations 2002. Medigear.uk confirms CE marking, the declaration of conformity and UKCA status at quotation.

Keep the calibration markings clean and legible, since a scale that cannot be read is the one thing this frame is bought for. Check that adjustments hold their setting, keep the cells free of lens debris, and store it cased. Typical warranty is 12 months, confirmed at quotation.