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ENT, Ophthalmic & Sensory
Visionstar HLS-22

✓ Certified Professional Seller

Visionstar ENT, Ophthalmic & Sensory

Visionstar HLS-22

Product Code: EOAS-ECA-3674

A steel handle on every prism, so fingers never touch the optic.

Pick up each prism by its handle and keep the faces clean: twenty-two acrylic prisms from ½ to 50 Δ, each 37 × 37 mm and mounted on a stainless steel stick, plus a red filter, in an aluminium case.

Sections

Examination Lenses & Racks

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Each prism in the HLS-22 from Visionstar is mounted on a stainless steel stick. The set has twenty-two acrylic prisms: ½, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45 and 50 Δ, each listed at 37 × 37 mm. A red filter lens brings the total to 23 pieces, which matches the list. The set is packed in an aluminium case, and the photograph shows the prisms in rows with their handles upright. The calibration position, case dimensions, weight and power marking are not published, and neither is the way each stick is fixed to its prism.

The handle changes how the examination runs. During a prism cover test the examiner holds the prism with one hand and moves the occluder with the other, changing prisms as the angle is neutralised. A stick lets the prism be picked up, positioned and swapped without the fingers touching the optical faces. The faces stay free of fingerprints that blur the target, and the examiner's hand sits clear of the patient's face. The set covers every whole value to 10 Δ, then 2 Δ steps to 20 Δ and 5 Δ steps to 50 Δ, so most angles need one prism in one position.

Plastic prisms are generally calibrated for the position of minimum deviation, with the frontal plane position as a close practical equivalent. This datasheet states neither, so the holding position, and how the stick relates to it, should be confirmed.

Medigear.uk lists the HLS-22 and can arrange delivery worldwide. Request the calibration position, stick fixing method, power and base marking, case dimensions and the declaration of conformity from the seller before order.

Orthoptic departments measure strabismus with the prism cover test many times a day. A prism on a handle can be lifted, oriented and exchanged quickly while the other hand works the occluder, and the faces stay free of fingerprints that blur the fixation target.

Paediatric clinics benefit from the handle when measuring young children, because the examiner's fingers stay back from the child's face and a prism can be swapped in a moment when fixation wanders. Large infantile esotropias and sensory exotropias are covered by single prisms up to 50 Δ.

Strabismus surgery planning depends on the largest reliable angle at distance and near. One prism held in its confirmed calibration position avoids the errors of stacking, and a stick helps the examiner keep that position steady.

Neuro-ophthalmology services measuring acquired diplopia can use the low values, ½ to 10 Δ in single steps, for small vertical deviations and prism trials, with the red filter helping patients identify each image.

Busy clinics with shared equipment gain from prisms that can be cleaned without handling the optical faces, supporting a simple wipe-down routine between patients.

Optometry practices with a binocular vision interest can use the handled low powers for fusional reserves and prism trials.

The set is less suited to clinics that prefer a single prism bar, and to buyers who need documented calibration or stick fixing without first confirming them. Institutional buyers commonly ask for evidence of conformity. The conformity documentation those procurement routes require is issued by the manufacturer and provided by the seller.

Fingers Stay Off the Optic

A stainless steel stick on each prism means the faces are never handled, so the target stays clear.

Faster Changes Mid-Test

Prisms can be picked up and exchanged by the handle while the other hand works the occluder.

Hand Kept Clear of the Face

The stick keeps the examiner's fingers back from the patient, which helps with young children.

Single Prisms to 50 Δ

Most angles, including large infantile and sensory deviations, are neutralised with one prism.

Every Whole Value to 10 Δ

Single steps from 1 to 10 Δ, plus ½ Δ, give fine control for small deviations and prism trials.

Simpler Cleaning

Handles let the prism faces and sticks be cleaned without touching the working surfaces.

Red Filter Included

A red filter lens supports diplopia assessment.

Aluminium Case

A rigid case with a carry handle holds the prisms upright in rows, per the photograph.

Powers

½, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45 and 50 Δ.

Prism Count

Twenty-two.

Mounting

Each prism mounted on a stainless steel stick.

Red Filter

One red filter lens.

Total Pieces

Twenty-three, per the datasheet.

Prism Size

37 × 37 mm.

Material

Acrylic prisms.

Case

Aluminium, with prisms held upright in rows, per the photograph.

Calibration Position

Not stated on the datasheet.

Stick Fixing

Not described.

Power and Base Marking

Not described.

Case Dimensions and Weight

Not published.

The HLS-22 puts twenty-two acrylic prisms from ½ to 50 Δ on stainless steel sticks, with a red filter, in an aluminium case. The handles keep fingers off the optical faces, speed up prism changes during the cover test and keep the examiner's hand clear of the patient, while single prisms to 50 Δ avoid stacking. The calibration position and stick fixing are not stated and should be confirmed. Medigear.uk lists the HLS-22 for business buyers worldwide and can arrange delivery, familiarisation and service cover. Request the calibration position, stick fixing, marking, case dimensions and the declaration of conformity from the seller at quotation.

FAQ

Frequently Asked Questions

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

Twenty-two acrylic prisms on stainless steel sticks and one red filter lens, 23 pieces in all, in an aluminium case. The powers are ½, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45 and 50 Δ. Ask the seller for a written packing list and check the case on delivery.

It gives the examiner a handle. Prisms can be lifted from the case, turned to the right base direction and placed before the eye without fingers on the optical faces, which keeps the target clear. It also keeps the examiner's hand a little further from a child's face and makes a quick change of prism easier while the other hand works the occluder.

The datasheet does not say. On some mounted prisms the handle sits in a fixed relation to the base, which helps orientation, but that is not stated here. Ask the seller how the base is marked and whether the stick position indicates it.

In the position they were calibrated for, which the datasheet does not state. Plastic prisms are generally calibrated for the position of minimum deviation, and published guidance treats the frontal plane position, with the back face parallel to the patient's face, as a close practical equivalent. Confirm the position with the seller and check that the stick lets the prism be held that way comfortably.

Not published. Ask how the stick is fixed and whether a loose or damaged prism can be replaced on its own, since a prism that twists on its handle can drift out of position during a measurement.

Stacking prisms in the same direction before one eye does not add their labelled powers, and published work by Thompson and Guyton found surprisingly large errors when a small prism is added to a large one. With single prisms up to 50 Δ, most angles are measured with one. Beyond 50 Δ, prism can be divided between the eyes as an approximation.

A study of 143 children with esotropia found 95% limits of agreement of about ±10 Δ for the difference between two prism and alternate cover test measurements at distance, for angles over 20 Δ. Using the same set and holding method at each visit keeps avoidable variation out of the comparison.

A red filter before one eye makes that eye's image look red, so a patient with diplopia can say which image belongs to which eye. The datasheet does not describe its intended use.

The handles make it easier to clean the prism faces and the sticks separately. Acrylic scratches easily and some solvents can craze it, so use only agents the manufacturer approves on the optics. Disinfectant compatibility for the acrylic and the stick fixing is not published.

The datasheet claims no product standard, and none is cited here. Under UK MDR 2002 loose prisms are typically Class I, or higher, use-dependent, confirmed against the declaration of conformity at order. The declaration is issued by the manufacturer and provided by the seller. Conformity requirements differ by destination market, and the seller confirms what applies where the unit is going.

Orthoptists, ophthalmologists and optometrists use loose prisms to measure strabismus and trial prism corrections. In the UK, orthoptists are registered with the Health and Care Professions Council and optometrists with the General Optical Council. Other countries set their own professional rules.

A clinic that wants to move through powers without changing pieces will find each value here is a separate prism. A service that needs prisms stored flat in a slim case should check the case dimensions, since upright handles need depth. A buyer who needs documented calibration, marking or stick fixing should obtain them in writing before order.