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ENT, Ophthalmic & Sensory
Visionstar HB-16 and VB-15

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Visionstar ENT, Ophthalmic & Sensory

Visionstar HB-16 and VB-15

Product Code: EOAS-ECA-3665

Horizontal and vertical bars, one case, one measurement of the whole deviation.

Measure both parts of a deviation at the same visit: a horizontal bar from 1 to 45 Δ and a vertical bar from 1 to 30 Δ, packed side by side in a foam-lined aluminium case with twin clasps and a carry handle.

Sections

Examination Lenses & Racks

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Packaged as a pair, the HB-16 and VB-15 set from Visionstar combines a horizontal and a vertical prism bar in one aluminium case. The datasheet for the set names the two bars and the case, and nothing more. The component datasheets give the bars' published specifications: the horizontal bar carries sixteen acrylic prisms of 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40 and 45 Δ, and the vertical bar fifteen acrylic prisms of 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25 and 30 Δ. The case dimensions, weight and calibration positions of both bars are not published.

The set exists for deviations with more than one component. A fourth nerve palsy produces a vertical deviation that often comes with a horizontal element, and many strabismus patients need both measured in several gaze positions. With both bars in one case, the orthoptist or clinician measures each component at the same sitting without fetching a second instrument. Holding one bar before each eye is the usual way to measure both at once, because stacking a horizontal and a vertical bar in front of the same eye can introduce error unless the bars were designed to be combined.

The photograph shows a silver aluminium case with black corner guards, two clasps, a carry handle and a black foam insert cut to hold the bars.

Medigear.uk lists the set and can arrange delivery worldwide. Request the calibration position of each bar in writing, confirmation of whether the leather sleeves are included, case dimensions and the declaration of conformity from the seller before order.

Orthoptic departments are the main clinical setting. Patients with fourth nerve palsy, thyroid eye disease or childhood strabismus with a vertical element need both components measured in primary position and in the diagnostic gaze positions. With both bars in one case, the orthoptist moves from one component to the other without leaving the patient.

Neuro-ophthalmology and stroke services assess acquired diplopia, where a skew deviation or cranial nerve palsy may combine vertical and horizontal misalignment. Serial measurement of both components tracks recovery, and published limits of agreement show why the same equipment and technique should be used at every visit.

Strabismus surgery planning depends on accurate measurement of every component in several gaze positions. Confirming the calibration position of each bar before those measurements is part of accurate surgical dosing.

Outreach and peripatetic orthoptic services carrying their equipment between hospital sites, community clinics and schools benefit from a single aluminium case with clasps and a foam insert that keeps both bars separated in transit.

Teaching clinics can use the set to show students how horizontal and vertical components are measured together, including the reasons for holding one bar before each eye and recording each component separately in every gaze position.

The set is less suited to clinics that only measure horizontal deviations, and to services that frequently measure angles beyond the range of the bars. 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.

Both Components at One Sitting

Horizontal and vertical bars sit in the same case, so both components of a deviation are measured in one examination.

One Bar Before Each Eye

Having both bars to hand makes it straightforward to place one before each eye, the usual way to measure a combined deviation.

Broad Range in Both Directions

The horizontal bar reaches 45 Δ and the vertical bar 30 Δ, per the component datasheets.

Fine Steps for Small Vertical Angles

The vertical bar runs in 1 Δ steps from 1 to 6 Δ, where many vertical deviations sit.

Protective Aluminium Case

A rigid aluminium case with corner guards protects the acrylic faces between sites.

Foam Insert

The photograph shows a foam insert cut to hold the bars apart, which limits scratching.

Twin Clasps and Handle

Two clasps secure the lid, and a handle makes the case easy to carry between rooms.

No Electrical Upkeep

The bars have no electrical parts, need no mains supply and never enter a portable appliance testing schedule.

Horizontal Bar

HB-16: 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40 and 45 Δ, per its component datasheet.

Vertical Bar

VB-15: 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25 and 30 Δ, per its component datasheet.

Bar Material

Acrylic, per the component datasheets.

Case

Aluminium, per the set datasheet.

Case Details

Silver finish, black corner guards, two clasps and a carry handle, per the photograph.

Insert

Black foam cut to hold the bars, per the photograph.

Leather Sleeves

Inclusion not stated on the set datasheet.

Calibration Position

Not stated for either bar.

Power and Base Marking

Not described on the set datasheet.

Dimensions

Not published for the case.

Weight

Not published.

Power Source

None. The set has no electrical parts.

The HB-16 and VB-15 set puts a horizontal prism bar to 45 Δ and a vertical bar to 30 Δ into one foam-lined aluminium case, so both parts of a deviation can be measured at the same sitting with one bar before each eye. It suits orthoptic, neuro-ophthalmology and strabismus surgery work where combined deviations are common. The calibration position of each bar is not stated and must be confirmed before measurements guide surgery. Medigear.uk lists the set for business buyers worldwide and can arrange delivery, familiarisation and service cover. Request each bar's calibration position, the packing list, 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.

The set datasheet names the HB-16 horizontal prism bar, the VB-15 vertical prism bar and an aluminium case. The photograph shows a foam insert cut to hold them. The individual bars are listed elsewhere with leather packaging, and the set datasheet does not say whether those leather sleeves are supplied as well. Ask the seller for a written packing list.

The horizontal bar has sixteen prisms: 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40 and 45 Δ. The vertical bar has fifteen: 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25 and 30 Δ. Both are acrylic, according to the component datasheets. These figures come from those datasheets, since the set datasheet repeats none of them.

The usual approach is to hold one bar before each eye, for example the horizontal bar before one eye and the vertical bar before the other, then neutralise both components with the prism and alternate cover test. Stacking the two bars in front of one eye can add error unless the bars were designed and calibrated to be combined, which the datasheet does not claim. Ask the seller whether the manufacturer permits stacking.

Fourth nerve palsy, thyroid eye disease, skew deviation, dissociated vertical deviation and many childhood strabismus patterns have both horizontal and vertical components. Measuring each in primary position and in the diagnostic gaze positions shows whether the deviation varies with gaze, which helps distinguish a paralytic or restrictive cause and supports surgical planning.

In the position each was calibrated for, which the datasheets do not state. Plastic prism bars are commonly calibrated for the frontal plane position, with the flat back surface parallel to the patient's face. Published bench testing found that makers differ, and that holding errors grow with power. Get the calibration position of each bar in writing, and mark it on the case lid so every examiner holds them identically.

In a study of 143 children with esotropia, the 95% limits of agreement for the difference between two prism and alternate cover test measurements were about ±10 Δ at distance for angles over 20 Δ. The authors judged changes of about 12 Δ or more at those angles likely to be real. Consistent equipment and holding technique keep avoidable variation out of those comparisons.

The horizontal bar stops at 45 Δ and the vertical bar at 30 Δ. Larger deviations need loose prisms of higher power or dividing prism between the eyes, recognising that combined values are approximate.

Not published. Ask the seller for both, particularly if the set will travel between clinics.

The datasheet claims no product standard, and none is cited here. Under UK MDR 2002 prism bars 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 measure strabismus with prism bars. 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.

Acrylic scratches easily, and some solvents can craze it. Clean the bars only with agents the manufacturer approves, return them to their foam cut-outs after each patient, and inspect the prism faces for scratches. Disinfectant compatibility is not published.

A clinic that only measures horizontal deviations may need just one bar. A service that often measures angles beyond 45 Δ horizontally or 30 Δ vertically will need loose prisms as well. A buyer who needs documented calibration and case dimensions should obtain them in writing before order.